Datasheet

FS98O22

Rev. 1.6 41/146

5.1. Oscillator State

Figure 5-2 FS98O22 oscillator state block

Table 5-2 FS98O22 clock system register table

There are two clock sources in FS98O22. One is the internal clock which generates 1 MHZ for CPU, and the

other is an external one which provides 32768 HZ clock signal to the Chip. Users should choose one clock to

use as MCK. Please see Figure 5-2.

There are 2 clock signals working in FS98O22: MCK and CLK. Users should use Table 5-2 and 5-3 to setup

MCK and CLK based on the M0_CK, M1_CK and M3_CK.

Table 5-3 MCK selection table

M3_CK M0_CK

MCK

X 0 ICK

0 1 ECK

1 1 ECK/2

Table 5-4 CLK selection table

M1_CK

0 MCK

1 MCK/4

Address Name

Referenced

Section

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value on Power

on Reset

14H MCK 5 M7_CK M6_CK M5_CK M3_CK M2_CK M1_CK M0_CK 00000000

FORTUNE'

Properties

For Reference Only