ARM ARM DUI 0224I 4.24 Timers

Programmer’s Reference

4.24 Timers

The Dual-Timer module is an AMBA compliant SoC peripheral that is developed,

tested, and licensed by ARM Limited. There are two Dual-Timer modules present in the

ARM926EJ-S PXP Development Chip.

The features of the Dual-Timer module are:

• Two 32/16-bit down counters with free-running, periodic and one-shot modes.

• Common clock with separate clock-enables for each timer gives flexible control

of the timer intervals.

• Interrupt output generation on timer count reaching zero.

• Identification registers that uniquely identify the Dual-Timer module. These can

be used by software to automatically configure itself.

At reset, the timers are clocked by a 32KHz reference from an external oscillator

module. Use the system controller to change the timer reference from 32KHz to 1MHz

(see the ARM926EJ-S Development Chip Reference Manual).

Table4-72 Timer implementation

Property Value

Location ARM926EJ-S PXP Development Chip

Memory base address

0x101E2000

for Timer 0

0x101E2020

for Timer 1

0x101E3000

for Timer 2

0x101E3020

for Timer 3.

Interrupt 4 on primary controller for Timers 0 and 1 5 on primary

controller for Timers 2 and 3

DMA NA

Release version ARM Dual-Timer SP804 r1p0-02ltd0

Reference documentation ARM PrimeCell Timer Module (SP804) Technical Reference

Manual