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參數(shù)資料
| 型號： | 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)： | 11/32頁 |
| 文件大?。?/td> | 133K |
| 代理商： | UPD4991ACX |
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μ
PD4991A
11
FUNCTION OUTLINE
The
μ
PD4991A has the following three modes:
1
BASIC TIME MODE
In this mode, data can be written and read between the timer counter and the CPU. Moreover, control
registers 1 and 2 can be specified by a command*.
2
ALARM SET & TP
1
CONTROL MODE
In this mode, data is set to the alarm register, the function of TP
1
is set, and control registers 1 and 2 are
specified by a command*.
3
ALARM SET & TP
2
CONTROL MODE
In this mode, data is set to the alarm register, the function of TP
2
is set, the 12- or 24-hour mode is selected,
leap year identification function is set, and control registers 1 and 2 are specified by a command*.
* Control registers 1 and 2 are commonly used in all the modes.
To select a mode, write mode data to ADDRESS = “F
H
.” Once a mode has been set, it is retained until a new
mode is set.
Table 1 shows the correspondence between modes and mode data.
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