Datasheet

FS98O22

Rev. 1.6 53/146

6.1. Timer Module

The Timer module has the following features:

z 8-bit Timer Counter

z Internal (1 MHZ) or External (32768HZ) clock selection

z Time out Interrupt Signal selection

8 bits Counter

Reset

Out

8 to 1

Mux

Timer Interrupt SignalTMOUT[7:0]

TMRST

TMEN

Frequency

Divider

TMCLK/4

TMCLK

Figure 6-1 FS98O22 timer module function block

Please see Figure 6-1. The input of Timer Module is TMCLK. (Please refer to Section 5.7 for the detailed

setting) FS98O22 embeds a Frequency Divider in the Timer Module to divide the TMCLK by 4, and treats the

divided clock signal as 8-bit counter input clock. When a user sets the Timer Module enable flag, the 8-bit

counter will activate, and the TMOUT[7:0] will increase from 0x00H to 0xFFH. User needs to setup INS (Timer

Module interrupt Signal Selector) to select the time out interrupt signal. When timer out event happens, the

interrupt Flag will set itself and the program counter will jump to 0x04H for ISR (Interrupt Service Routine)

FORTUNE'

Properties

For Reference Only