參數(shù)資料
型號(hào): UPD4991ACX
廠商: NEC Corp.
英文描述: 4-BIT PARALLEL I/O CALENDAR CLOCK
中文描述: 4位并行I / O日歷鐘
文件頁數(shù): 12/32頁
文件大?。?/td> 133K
代理商: UPD4991ACX
μ
PD4991A
12
Table 1 Correspondence between Mode Data and Modes
ADDRESS = (1, 1, 1, 1)
DATA
FUNCTION
MSB
LSB
0
*
0
0
BASIC TIME MODE
0
*
0
1
ALARM SET & TP
1
CONTROL MODE
0
*
1
0
ALARM SET & TP
2
CONTROL MODE
0
*
1
1
BASIC TIME MODE
1
*
*
*
Inhibited
* Irrelevant. This bit is ignored.
Note
: The difference between mode (0, *, 0, 0) and mode (0, *, 1, 1) is that stages
10 to 15 of the 15-stage divider circuit are reset in the former mode when
the division stage reset command (
±
30 ADJ. RESET) is executed, and all
the stages of the divider circuit are reset in the latter mode.
Other commands are commonly used in both modes.
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