HD404449 Datasheet, PDF (40/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 Series
System clock select register (SSR: $029)
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR3
2
0
W
SSR2
1
0
W
SSR1
0
—
—
Not used
SSR2
0
1
32-kHz oscillation division
ratio selection
f_SUB = f_X/8
f_SUB = f_X/4
SSR3
0
1
32-kHz oscillation stop
Oscillation operates in stop mode
Oscillation stops in stop mode
SSR1
0
1
System clock selection
0.4 to 1.0 MHz
1.6 to 4.0 MHz
Figure 26 System Clock Select Register
D₀
GND
X2
X1
RESET
OSC₂
OSC₁
TEST
AV_SS
GND
Figure 27 Typical Layouts of Crystal and Ceramic Oscillator
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