參數(shù)資料
型號: HD404339
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微電腦(4位單片微計算機)
文件頁數(shù): 29/78頁
文件大?。?/td> 491K
代理商: HD404339
HD404339 Series
29
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR13
*
1
2
0
W
SSR12
0
Not used
1
0
W
SSR11
System clock selection register 1 (SSR1: $027)
System Clock Selection
*
2
0.4 to 1.0 MHz
1.6 to 4.5 MHz
SSR11
0
1
SSR12
0
1
Ratio Selection
f
SUB
= f
X
/8
f
SUB
= f
X
/4
32-kHz Oscillation Division
SSR13
0
1
32-kHz Oscillation Stop
Oscillation operates in stop mode
Oscillation stops in stop mode
Notes:
*
1
*
2
SSR13 will only be cleared to 0 by a
RESET
input. A
STOPC
input during stop mode will not
clear SSR13. Also note that SSR13 will not be cleared upon transition to stop mode.
When the subsystem oscillator (32.768 kHz crystal oscillator) is used, set 0.4 MHz
f
OSC
1.0MHz
or 1.6 MHz
f
OSC
4.5 MHz.
Figure 20 System Clock Selection Register 1 (SSR1)
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
SSR20
1
0
W
SSR21
System clock selection register 2 (SSR2: $028)
SSR21
0
0
1
1
SSR20
0
1
0
1
System Clock Division Ratio
1/4 division
1/8 division
1/16 division
1/32 division
Figure 21 System Clock Selection Register 2 (SSR2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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