ADuC7122BBCZ datasheet(87/96 Pages) AD

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Data Sheet

ADuC7122

78B

TIMER2—WAKE-UP TIMER

Timer2 is a 32-bit wake-up timer, count down or count up, with

a programmable prescaler. The prescaler is clocked directly from 1

of 4 clock sources, including the core clock (default selection),

the internal 32.768 kHz oscillator, the external 32.768 kHz

watch crystal, or the PLL undivided clock. The selected clock

source can be scaled by a factor of 1, 16, 256, or 32,768. The

wake-up timer continues to run when the core clock is disabled.

This gives a minimum resolution of 22 ns when the core is

operating at 41.78 MHz and with a prescaler of 1. Capture of

the current timer value is enabled if the Timer2 interrupt is

enabled via IRQEN[4] (see Table 128).

The counter can be formatted as plain 32-bit value or as

hours:minutes:seconds:hundredths.

Timer2 reloads the value from T2LD either when Timer2

overflows or immediately when T2ICLR is written.

The Timer2 interface consists of four MMRs, shown in

Table 158.

Table 158. Timer2 Interface Registers

Description

T2LD

32-bit register. Holds 32-bit unsigned integers.

T2VAL

32-bit register. Holds 32-bit unsigned integers. This

T2CLRI

8-bit register. Writing any value to this register clears

the Timer2 interrupt.

T2CON

Configuration MMR.

Table 159. Timer2 Load Registers

Name

Address

Default Value

Access

T2LD

0xFFFF0340

0x00000

R/W

T2LD is a 32-bit register, which holds the 32-bit value that is

loaded into the counter.

Table 160. Timer2 Clear Register

Name

Address

Default Value

Access

T2CLRI

0xFFFF034C

0x00

This 8-bit write-only MMR is written (with any value) by user

code to refresh (reload) Timer2.

Table 161. Timer2 Value Register

Name

Address

Default Value

Access

T2VAL

0xFFFF0344

0x0000

T2VAL is a 32-bit register that holds the current value of Timer2.

Table 162. Timer2 Control Register

Name

Address

Default Value

Access

T2CON

0xFFFF0348

0x0000

R/W

This 32-bit MMR configures the mode of operation for Timer2.

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