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參數(shù)資料
| 型號(hào)： | M34280 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single-Chip 4-Bit CMOS Microcomputer for Infrared Remote Control Transmitters(用于紅外線遠(yuǎn)程遙控發(fā)送器的4位單片機(jī)) |
| 中文描述： | 單芯片4位CMOS紅外遙控發(fā)射器（用于紅外線遠(yuǎn)程遙控發(fā)送器的4位單片機(jī)微機(jī)） |
| 文件頁數(shù)： | 19/47頁 |
| 文件大小： | 508K |
| 代理商： | M34280 |
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MITSUBISHI
ELECTRIC
19
MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
(4) Return signal
An external wakeup signal is used to return from the RAM
back-up mode. Table 8 shows the return condition for each
return source.
Remarks
Only key-on wakeup function of the port whose pull-down transistor is
turned ON is valid.
Key-on wakeup function is always valid.
Return source
Ports D
7
, E
0
, E
1
Ports G, E
2
Return condition
Return by an external “H” level
input.
Return by an external “H” level
input.
Table 8 Return source and return condition
(5) Pull-down control register PU0
Pull-down control register PU0
Register PU0 controls the ON/OFF of pull-down transistor,
input, key-on wakeup function of ports E
0
, E
1
and D
7
.
Table 9 Pull-down control register
PU0
2
PU0
1
PU0
0
Pull-down transistor OFF, input circuit OFF, key-on wakeup invalid
Pull-down transistor ON, input circuit ON, key-on wakeup valid
Pull-down transistor OFF, key-on wakeup invalid
Pull-down transistor ON, key-on wakeup valid
Pull-down transistor OFF, key-on wakeup invalid
Pull-down transistor ON, key-on wakeup valid
Port D
7
pull-down control bit
Port E
1
pull-down control bit
Port E
0
pull-down control bit
Pull-down control register PU0
at reset : 000
2
at RAM back-up : state retained
W
0
1
0
1
0
1
Note: “W” represents write enabled.
Fig. 21 State transition
Fig. 22 Set source and clear source of the P flag
Fig. 23 Start condition identified example using the SNZP
instruction
S
R
Q
Power down flag P
POF instruction
Reset input
G
Set source POF instruction is executed
G
Clear source Reset input
Software start
P = “1”
Yes
Warm start
Cold start
No
Set the contents of this register through register A with the
TPU0A instruction.
: Microcomputer starts its operation after f(X
IN
) is counted to16384 times.
Stabilizing time a
POF instruction
is executed
A
f(X
IN
) oscillation
Return input
(Stabilizing time a )
B
(RAM back-up
mode)
f(X
IN
) stop
Reset
(Stabilizing time a )
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