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参数资料
| 型号： | UPD4990AC-A |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP14 |
| 封装： | DIP-14 |
| 文件页数： | 4/51页 |
| 文件大小： | 211K |
| 代理商： | UPD4990AC-A |
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7
CHAPTER 2 FUNCTION SPECIFICATION
2.1 COMMAND SETTING
The
PD4990A has parallel command mode using C0, C1, C2 and serial command mode transferring data serially.
2.1.1 Parallel Command Mode
C0, C1 and C2 are used on this mode. This mode is compatible
PD1990A except TEST COMMAND (C0, C1, C2
= 1, 1, 1). Same software for
PD1990A can be used for PD4990A except TEST COMMAND. But this mode has
not year count, leap year and interval timer. Please show Table 2-1, Fig. 2-1.
2.1.2 Serial Command Mode
While C0, C1, and C2 is high, command is set serially to DATA IN.
Command is consist of 4 bit. Command is transferred from C0’ (LSB) to C3’ by positive edge of CLK, and while
STB is high,
PD4990A read command. When STB is low, PD4990A latches command. This mode has year count,
leap year, timing pulse, and interval timer.
Table 2-1 Parallel Command
Commands input from C0, C1, and C2 terminals (1 ... H, 0 ... L)
Shift register 40 bit (The year function is ineffective.)
(Operates as the existing
PD1990AC in other than test mode)
C2
C1
C0
FUNCTION
0
REGISTER HOLD
DATA OUT = 1 Hz
0
1
REGISTER SHIFT
DATA OUT = [LSB] = 0 or 1
0
1
0
TIME SET & COUNTER HOLD
DATA OUT = [LSB] = 0 or 1
0
1
TIME READ
DATA OUT = 1 Hz
1
0
TP = 64 Hz
1
0
1
TP = 256 Hz
1
0
TP = 2048 Hz
1
SERIAL COMMAND TRANSFER MODE
* The test mode is cancelled by [C2, C1, C0] = [0, 0, 0] to [1, 1, 0]
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