Ultra-Low-Power Timer (ULPT) register layout for the Renesas RA8D2. More...

#include <stdint.h>
#include "ra8_attributes.h"

Include dependency graph for ra8_ulpt_regs.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	r_ulpt_regs_t
	Per-channel ULPT register window. More...

Enumerations
enum	ra8_ulpt_addr_t : uintptr_t { k_ra8_ulpt0_base_addr = 0x40220000UL , k_ra8_ulpt1_base_addr = 0x40220100UL }
	Memory-mapped base addresses for ULPT. More...
enum	ra8_ulpt_limits_t : uint16_t { k_ra8_ulpt_channel_count = 2U , k_ra8_ulpt_channel_stride = 0x100U }
	Channel count and stride. More...
enum	ra8_ulptcr_bit_t : uint8_t { k_ra8_ulpt_bit_tstart = 0U , k_ra8_ulpt_bit_tcstf = 1U , k_ra8_ulpt_bit_tstop = 2U , k_ra8_ulpt_bit_tunf = 4U , k_ra8_ulpt_bit_tedga = 5U , k_ra8_ulpt_bit_tedgb = 6U }
	ULPTCR control-bit positions. More...
enum	ra8_ulpt_mask_t : uint8_t { k_ra8_ulpt_mask_tstart = 0x01U , k_ra8_ulpt_mask_tcstf = 0x02U , k_ra8_ulpt_mask_tstop = 0x04U }
	ULPTCR bit masks. More...

Functions
static volatile r_ulpt_regs_t *	ra8_ulpt (uint8_t channel)
	Get pointer to ULPT channel channel.

Detailed Description

Ultra-Low-Power Timer (ULPT) register layout for the Renesas RA8D2.

The Ultra-Low-Power Timer is a 32-bit down-counter that can run on the sub-clock or LOCO in deep-sleep modes. RA8D2 exposes two channels (ULPT0 and ULPT1) at 0x40220000 / 0x40220100 (stride 0x100) per FSP R_ULPT0_BASE / R_ULPT1_BASE.

Per-channel register map (verified against FSP R_ULPT0_Type in R7KA8D2KF_core0.h lines 30865-31006):

Offset	Name	Width	Purpose
0x00	ULPTCNT	32	32-bit counter / reload
0x04	ULPTCMA	32	Compare match A
0x08	ULPTCMB	32	Compare match B
0x0C	ULPTCR	8	Control (start / stop / flags)
0x0D	ULPTMR1	8	Mode register 1
0x0E	ULPTMR2	8	Mode register 2
0x0F	ULPTMR3	8	Mode register 3
0x10	ULPTIOC	8	I/O control

Register offsets tracked against HUM Ch 25 "Ultra-Low-Power Timer (ULPT)" p 1187.

Copyright: Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Definition in file ra8_ulpt_regs.h.

Enumeration Type Documentation

◆ ra8_ulpt_addr_t

enum ra8_ulpt_addr_t : uintptr_t

Memory-mapped base addresses for ULPT.

Enumerator
k_ra8_ulpt0_base_addr	ULPT0 base (FSP R_ULPT0_BASE).
k_ra8_ulpt1_base_addr	ULPT1 base (FSP R_ULPT1_BASE).

Definition at line 47 of file ra8_ulpt_regs.h.

◆ ra8_ulpt_limits_t

enum ra8_ulpt_limits_t : uint16_t

Channel count and stride.

Enumerator
k_ra8_ulpt_channel_count	ULPT0 and ULPT1.
k_ra8_ulpt_channel_stride	Bytes between channels.

Definition at line 56 of file ra8_ulpt_regs.h.

◆ ra8_ulpt_mask_t

enum ra8_ulpt_mask_t : uint8_t

ULPTCR bit masks.

Enumerator
k_ra8_ulpt_mask_tstart	TSTART bit.
k_ra8_ulpt_mask_tcstf	TCSTF count-status flag (RO).
k_ra8_ulpt_mask_tstop	TSTOP bit.

Definition at line 78 of file ra8_ulpt_regs.h.

◆ ra8_ulptcr_bit_t

enum ra8_ulptcr_bit_t : uint8_t

ULPTCR control-bit positions.

Enumerator
k_ra8_ulpt_bit_tstart	1 = start count, 0 = stop.
k_ra8_ulpt_bit_tcstf	Count-status flag (read-only).
k_ra8_ulpt_bit_tstop	Forced stop bit.
k_ra8_ulpt_bit_tunf	Underflow flag.
k_ra8_ulpt_bit_tedga	Edge detect flag A.
k_ra8_ulpt_bit_tedgb	Edge detect flag B.

Definition at line 65 of file ra8_ulpt_regs.h.

Function Documentation

◆ ra8_ulpt()

volatile r_ulpt_regs_t * ra8_ulpt ( uint8_t channel )

inlinestatic

Get pointer to ULPT channel channel.

Parameters

[in] channel Channel index (0..1).

Returns: Volatile pointer, or nullptr if channel is out of range.

Definition at line 105 of file ra8_ulpt_regs.h.

References k_ra8_ulpt0_base_addr, k_ra8_ulpt_channel_count, and k_ra8_ulpt_channel_stride.

Referenced by ra8_ulpt_deinit(), ra8_ulpt_get_status(), ra8_ulpt_init(), ra8_ulpt_set_period(), ra8_ulpt_start(), and ra8_ulpt_stop().

Data Structures

Enumerations

Functions