diff --git a/zynq7000-hal/src/lib.rs b/zynq7000-hal/src/lib.rs
index 4b6be52..2ea0b71 100644
--- a/zynq7000-hal/src/lib.rs
+++ b/zynq7000-hal/src/lib.rs
@@ -23,6 +23,7 @@ pub mod slcr;
 pub mod spi;
 pub mod time;
 pub mod uart;
+pub mod ttc;
 
 /// This enumeration encodes the various boot sources.
 #[derive(Debug, Copy, Clone)]
diff --git a/zynq7000-hal/src/ttc.rs b/zynq7000-hal/src/ttc.rs
new file mode 100644
index 0000000..a192252
--- /dev/null
+++ b/zynq7000-hal/src/ttc.rs
@@ -0,0 +1,45 @@
+//! Triple-timer counter (TTC) high-level driver.
+
+use arbitrary_int::u3;
+
+use crate::gpio::{IoPeriph, Mio30, Mio31, MioPin, MuxConf, PinMode};
+#[cfg(not(feature = "7z010-7z007s-clg225"))]
+use crate::gpio::{Mio18, Mio19, Mio42, Mio43};
+
+/// Each TTC consists of three independent timers/counters.
+#[derive(Debug, Copy, Clone)]
+pub enum TtcId {
+    Ttc0 = 0,
+    Ttc1 = 1,
+}
+
+pub const TTC_MUX_CONF: MuxConf = MuxConf::new_with_l3(u3::new(0b110));
+
+pub trait ClockInPin {
+    const ID: TtcId;
+}
+
+pub trait WaveOutPin {
+    const ID: TtcId;
+}
+
+macro_rules! into_ttc {
+    ($($Mio:ident),+) => {
+        $(
+            impl <M: PinMode> MioPin<$Mio, M> {
+                /// Convert the pin into a TTC pin by configuring the pin routing via the
+                /// MIO multiplexer bits.
+                pub fn into_ttck(self) -> MioPin<$Mio, IoPeriph> {
+                    // Enable pull-ups for the I2C pins.
+                    self.into_io_periph(TTC_MUX_CONF, None)
+                }
+            }
+        )+
+    };
+}
+
+#[cfg(not(feature = "7z010-7z007s-clg225"))]
+into_ttc!(Mio18, Mio19, Mio42, Mio43);
+into_ttc!(Mio30, Mio31);
+
+pub struct Pwm {}
diff --git a/zynq7000/src/i2c.rs b/zynq7000/src/i2c.rs
index 3f05b33..b06d2f8 100644
--- a/zynq7000/src/i2c.rs
+++ b/zynq7000/src/i2c.rs
@@ -1,3 +1,4 @@
+//! SPI register module.
 use arbitrary_int::{u2, u6, u10};
 
 pub const I2C_0_BASE_ADDR: usize = 0xE000_4000;
diff --git a/zynq7000/src/lib.rs b/zynq7000/src/lib.rs
index fb8dc5f..faac935 100644
--- a/zynq7000/src/lib.rs
+++ b/zynq7000/src/lib.rs
@@ -23,6 +23,7 @@ pub mod mpcore;
 pub mod slcr;
 pub mod spi;
 pub mod uart;
+pub mod ttc;
 
 static PERIPHERALS_TAKEN: AtomicBool = AtomicBool::new(false);
 
diff --git a/zynq7000/src/spi.rs b/zynq7000/src/spi.rs
index d87ccbf..74087fa 100644
--- a/zynq7000/src/spi.rs
+++ b/zynq7000/src/spi.rs
@@ -1,3 +1,4 @@
+//! SPI register module.
 use arbitrary_int::u4;
 
 pub const SPI_0_BASE_ADDR: usize = 0xE000_6000;
diff --git a/zynq7000/src/ttc.rs b/zynq7000/src/ttc.rs
new file mode 100644
index 0000000..041e0f0
--- /dev/null
+++ b/zynq7000/src/ttc.rs
@@ -0,0 +1,153 @@
+//! Triple-timer counter (TTC) register module.
+use arbitrary_int::u4;
+
+#[bitbybit::bitenum(u1, exhaustive = true)]
+pub enum ClockSource {
+    Pclk = 0b0,
+    Extewrnal = 0b1,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct ClockControl {
+    /// When this bit is set and the external clock is selected, the counter clocks on the
+    /// negative edge of the external clock input.
+    #[bit(6, rw)]
+    ext_clk_edge: bool,
+    #[bit(5, rw)]
+    clk_src: ClockSource,
+    #[bits(1..=4, rw)]
+    prescaler: u4,
+    #[bit(0, rw)]
+    prescale_enable: bool,
+}
+
+#[bitbybit::bitenum(u1, exhaustive = true)]
+pub enum Mode {
+    Overflow = 0b0,
+    Interval = 0b1,
+}
+
+#[bitbybit::bitenum(u1, exhaustive = true)]
+pub enum WavePolarity {
+    /// The waveform output goes from high to low on a match 0 interrupt and returns high on
+    /// overflow or interval interrupt.
+    HighToLowOnMatch1 = 0b0,
+    /// The waveform output goes from low to high on a match 0 interrupt and returns low on
+    /// overflow or interval interrupt.
+    LowToHighOnMatch1 = 0b1,
+}
+
+#[bitbybit::bitenum(u1, exhaustive = true)]
+pub enum WaveEnable {
+    Enable = 0b0,
+    Disable = 0b1,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct CountControl {
+    #[bit(6, rw)]
+    wave_polarity: WavePolarity,
+    /// Output waveform enable, active low. Reset value 1.
+    #[bit(5, rw)]
+    wave_enable_n: WaveEnable,
+    /// Resets the counter and restarts counting. Automatically cleared on restart.
+    #[bit(4, rw)]
+    reset: bool,
+    /// When this bit is set, an interrupt is generated when the count value matches one of the
+    /// three match registers and the corresponding bit is set in the IER register.
+    #[bit(3, rw)]
+    match_enable: bool,
+    /// When this bit is high, the timer counts down.
+    #[bit(2, rw)]
+    decrementing: bool,
+    #[bit(1, rw)]
+    mode: Mode,
+    #[bit(0, rw)]
+    disable: bool,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct Counter {
+    #[bits(0..=15, r)]
+    count: u16,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct RwValue {
+    #[bits(0..=15, rw)]
+    value: u16,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct InterruptStatus {
+    /// Even timer overflow interrupt.
+    #[bit(5, r)]
+    event: bool,
+    #[bit(4, r)]
+    counter_overflow: bool,
+    #[bit(3, r)]
+    match_2: bool,
+    #[bit(2, r)]
+    match_1: bool,
+    #[bit(1, r)]
+    match_0: bool,
+    #[bit(0, r)]
+    interval: bool,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct InterruptControl {
+    /// Even timer overflow interrupt.
+    #[bit(5, rw)]
+    event: bool,
+    #[bit(4, rw)]
+    counter_overflow: bool,
+    #[bit(3, rw)]
+    match_2: bool,
+    #[bit(2, rw)]
+    match_1: bool,
+    #[bit(1, rw)]
+    match_0: bool,
+    #[bit(0, rw)]
+    interval: bool,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct EventControl {
+    /// E_Ov bit. When set to 0, the event timer is disabled and set to 0 when an event timer
+    /// register overflow occurs. Otherwise, continue counting on overflow.
+    #[bit(2, rw)]
+    continuous_mode: bool,
+    /// E_Lo bit. When set to 1, counts PCLK cycles during low level duration of the external
+    /// clock. Otherwise, counts it during high level duration.
+    #[bit(1, rw)]
+    count_low_level_of_ext_clk: bool,
+    #[bit(0, rw)]
+    enable: bool,
+}
+
+#[bitbybit::bitfield(u32)]
+pub struct EventCount {
+    #[bits(0..=15, r)]
+    count: u16,
+}
+
+/// Triple-timer counter
+#[derive(derive_mmio::Mmio)]
+#[repr(C)]
+pub struct Ttc {
+    clk_cntr: [ClockControl; 3],
+    cnt_ctrl: [CountControl; 3],
+    #[mmio(PureRead)]
+    current_counter: [Counter; 3],
+    interval_value: [RwValue; 3],
+    match_value_0: [RwValue; 3],
+    match_value_1: [RwValue; 3],
+    match_value_2: [RwValue; 3],
+    #[mmio(Read)]
+    isr: [InterruptStatus; 3],
+    ier: [InterruptControl; 3],
+    event_cntrl: [EventControl; 3],
+    #[mmio(PureRead)]
+    event_reg: [EventCount; 3],
+}
diff --git a/zynq7000/src/uart.rs b/zynq7000/src/uart.rs
index 915e009..d04b42b 100644
--- a/zynq7000/src/uart.rs
+++ b/zynq7000/src/uart.rs
@@ -1,4 +1,4 @@
-//! UART register module.
+//! PS UART register module.
 use arbitrary_int::u6;
 
 pub const UART_0_BASE: usize = 0xE000_0000;