參數資料
型號: HCD404082
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉換器的低壓微計算機)
中文描述: 低電壓如同在微機芯片的A / D轉換器(帶片上的A / D轉換器的低壓微計算機)
文件頁數: 57/162頁
文件大?。?/td> 482K
代理商: HCD404082
HD404374/HD404384/HD404389/HD404082/HD404084 Series
57
System clock select register (SSR: $004)
Make sure to set bit 3 of the system clock select register to 1 if the HD404374 series is being used without
the subsystem clock, and on the HD404384, HD404389, HD404082, and HD404084 series. The microcomputer
will malfunction if the setting is not 1.
Bit
Read/Write
Initial value on reset
Bit name
3
W
0
SSR3
2
W
0
SSR2*
1
W
0
SSR1*
0
W
0
SSR0
System clock division ratio switch
Division-by-4 (f
cyc
- f
OSC
/4)
0
1
Division-by-32 (f
cyc
- f
OSC
/32)
System clock division ratio switch
0
1
f
osc
=0.4–1.0MHz
f
osc
=1.6–8.5MHz
Subsystem clock division ratio switch
0
1
f
SUB
=fx/8
f
SUB
=fx/4
(HD404374 Series)
0
1
Subsystem clock operates in stop mode
Subsystem clock stops in stop mode
Note: * Applies to HD404374 Series.
The CR oscillation frequency differs depending on the operating voltage and resistance value.
Set SSR1 to match the operating frequency. Note that if the frequency being used does not
match the SSR1 setting, subsystems using the 32.768 kHz oscillation frequency will not
operate correctly.
Subsystem clock stop setting
This bit must be set to 1 following power-on and reset if the HD404374 series is being
used without the subsystem clock, and on the HD404384, HD404389, HD404082, and
HD404084 series. If it is set to 0 (the initial value), malfunctioning may occur in the stop
mode.
Figure 22 System Clock Select Register
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