HD404639R Datasheet, PDF (39/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

System clock select register 1 (SSR1: $029)
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR13
2
0
W
SSR12
1
0
W
SSR11
0
0
W
SSR10
HD404639R Series
SSR13 32-kHz oscillation stop
0 Oscillation operates in stop mode
1 Oscillation stops in stop mode
SSR12
0
1
32-kHz oscillation division
ratio selection
f_SUB = f_X/8
f_SUB = f_X/4
System clock
SSR23 SSR22 SSR11 SSR10 _selection
0
0
0
0 400 kHz
1 800 kHz
1
0 2 MHz
1 4 MHz
1 Don’t care Don’t care 3.58 MHz
1
0
1
1 8 MHz
1 Don’t care Don’t care _{7.16 MHz}
Figure 24 System Clock Select Register 1 (SSR1)
GND
X2
X1
RESET
OSC₂
OSC₁
TEST
GND
Figure 25 Typical Layouts of Crystal and Ceramic Oscillator
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