ARM Generic Timer

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Introduction

The ARM Generic Timer is a per-core implemented one-shot timer, built into the CPU (all Raspberry Pi models, memory mapped parts only on ARM Quad A7 CPUs, RPi2 and upwards).

Counters and frequency can be read using CNTP_CVAL (physical counter), CNTV_CVAL (virtual counter) and CNTP_FREQ (clock frequency) system registers. For IRQ routing, frequency setup and prescaler configuration the MMIO registers' address starts at 0x40000000.

This timer can operate on a CPU clock relative freqency (APB) and on a fixed crystal clock freqency (19.2MHz with a prescaler) as well, depending on configuration.

See Also

External Links

• ARM Architecture Reference Manual Chapters D8-D10 page D8-2264 (AArch64), Chapter G5 page G5-4851 (AArch32), Chapter I1 page I1-5856 and Chapters I3.5, I3.6 page I3-5946 (memory mapped parts)
• ARM Quad A7 Core Section 4.3, Page 9 (refers to Generic Timer as "Core Timer Register")