GPCE063A datasheet(13/29 Pages) GENERALPLUS

13 / 29 page

GPCE063A

Proprietary & Confidential

Oct. 04, 2013

Version: 1.8

PWM: Pulse Width Modulation

Refer to the above table, the configuration of IOA9, IOA10, IOA11,

and IOA12 involves feedback function in which an OSC

frequency can be obtained from EXT1 (EXT2) by simply adding a

RC circuit between IOA8 (IOA10) and IOA9 (IOA11).

6.9. Timer / Counter

GPCE063A provides three 16-bit timers/counters - TimerA,

TimerB and TimerC or so called universal counters.

The clock

sources of Timer A/B/C are from clock source Input 1 and clock

source Input 2 (see below table) which perform AND operation to

form the varieties of combinations.

When timer overflows, a

timeout signal (TAOUT) is sent to CPU interrupt module to

generate a timer interrupt signal.

In addition, Timer A/B/C

hardware interrupt events can be used to latch the DAC audio

output and trigger ADC conversion.

Example to Timer A, sending a write signal into TMA_CNT, the

value of TMA_DATA (value=N) will reload into TMA_CNT and set

an appropriated clock source.

Timer wills up-count from N, N+1,

N+2… 0XFFFF.

An INT signal is generated at the moment of

timer rolling over from “0xFFFF” to “0x0000”, and an INT signal is

processed by INT controller immediately.

At the same time, N

will be reloaded into TMA_CNT and start counting again.

In Timer A, the clock Input 1 is a high frequency source and clock

Input 2 is a low frequency clock source.

The combination of

clock

Input

and

provides

varieties

speeds

TimerA/CounterA - “1” representing pass signal (not gating), and

“0” meaning timer deactivated.

For instance, if Input 1=”1”, the

clock is depending on Input 2.

If Input 1=”0”, the TimerA is

deactivated.

The EXT1/ETX2 is the external clock source 1 and

external clock source 2.

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