參數(shù)資料
型號(hào): HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 101/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
101
System Clock Select Registers 1 and 2 (SSR1: $029, SSR2: $02A):
Four-bit write-only registers.
These registers must be set to the value specified in figures 85 and 86 depending on the frequency of the
oscillator connected to the OSC
1
and OSC
2
pins. Note that if the combination of the oscillation frequency
and the values in these registers is different from that specified in figures 85 and 86, the DTMF output
frequencies will differ from the correct frequencies as listed in table 28.
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR13
2
0
W
SSR12
0
0
W
SSR10
1
0
W
SSR11
System clock select register 1 (SSR1: $029)
SSR13
0
1
32-kHz oscillation stop
Oscillation operates in stop mode
Oscillation stops in stop mode
SSR12
0
1
32-kHz oscillation division
ratio selection
f = f /8
f = f /4
SSR22
0
1
0
1
400 kHz
800 kHz
2 MHz
4 MHz
3.58 MHz
8 MHz
7.16 MHz
SSR11
0
1
Don’t care
1
Don’t care
SSR10
0
1
0
1
Don’t care
1
Don’t care
System clock
selection
SSR23
0
1
Figure 85 System Clock Select Register 1(SSR1)
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