參數(shù)資料
型號: HD407A4669
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述: 低電壓如同在微機芯片的DTMF產(chǎn)生電路(帶雙音多頻電路的低電壓微計算機)
文件頁數(shù): 95/142頁
文件大小: 894K
代理商: HD407A4669
HD404669 Series
95
SSR23
0
System clock selection
400kHz
800 kHz
2 MHz
4 MHz
3.58 MHz
8 MHz
7.16 MHz
×
: Don't care
System clock select register 1 (SSR1: $029)
SSR22
0
SSR11
0
1
SSR10
0
1
0
1
×
1
×
1
0
1
×
1
×
1
SSR12
0
1
32 kHz division ratio switch
f
SUB
=f
X
/8
f
SUB
=f
X
/4
SSR13
0
1
32 kHz oscillation stop setting
Oscillation continues in stop mode
Oscillation stops in stop mode
SSR21
0
System clock division ratio selection
*
2
1
Division by 4
Division by 8
Division by 16
Division by 32
System clock select register 2 (SSR2: $02A)
SSR20
0
1
0
1
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR13
*
1
2
0
W
SSR12
0
0
W
SSR10
1
0
W
SSR11
Bit
Initial value
Read/Write
Bit name
3
0
W
SSR23
2
0
W
SSR22
0
0
W
SSR20
1
0
W
SSR21
1. SSR13 is cleared to 0 only by RESET input. In the case of
STOPC
input in stop mode it
retains its current value. SSR13 is not reset in stop mode
2. The DTMF generation circuit frequencies are not affected by the system clock division ratio
setting.
Notes:
Figure 73 System Clock Select Register 1 and 2 (SSR1, SSR2)
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