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參數(shù)資料
| 型號： | UPD4991A |
| 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)： | 13/32頁 |
| 文件大?。?/td> | 133K |
| 代理商： | UPD4991A |
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μ
PD4991A
13
MODE DESCRIPTION
1.
BASIC TIME MODE (MODE = 0 * 0 0 B)
Thirteen types of counters are provided: 10-year, 1-year, 10-month, 1-month, 10-day, 1-day, date, 10-hour, 1-
hour, 10-minute, 1-minute, 10-second, and 1-second.
Date codes are 00H through 06H (0000 through 0110B).
(Correspondence between dates and date codes can be freely specified by the user.)
If leap year identification function is not used, the last day of February is always the 28th.
The addresses corresponding to the respective digits are shown in Table 2 Address Correspondence 1.
Specifications of control registers 1 and 2 are commonly applied to each mode. Tables 3 and 4 show correspondences
of data 1 and 2. Refer to these data correspondence tables when setting other modes.
Table 2 Address Correspondence 1
BASIC TIME MODE (MODE = 0, *, 0, 0)
DATA
FUNCTION
MSB
LSB
0
0
0
0
1-second digit
R/W
0
0
0
1
10-second digit
R/W
0
0
1
0
1-minute digit
R/W
0
0
1
1
10-minute digit
R/W
0
1
0
0
1-hour digit
R/W
0
1
0
1
10-hour digit
R/W
0
1
1
0
Date digit
R/W
0
1
1
1
1-day digit
R/W
1
0
0
0
10-day digit
R/W
1
0
0
1
1-month digit
R/W
1
0
1
0
10-month digit
R/W
1
0
1
1
1-year digit
R/W
1
1
0
0
10-year digit
R/W
1
1
0
1
CONTROL REGISTER 1
W/O
1
1
1
0
CONTROL REGISTER 2
R/W
1
1
1
1
MODE REGISTER
W/O
R/W : READ AND WRITE
W/O : WRITE ONLY
Note
The second most-significant bit of the data for the 10-hour digit serves as
an AM/PM flag in the 12-hour mode (AM = 0/PM = 1).
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