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| 型號： | M34280E1FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 單芯片4位CMOS微機紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 11/47頁 |
| 文件大小： | 508K |
| 代理商： | M34280E1FP |
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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 D7, E0, E1
Ports G, E2
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 E0, E1 and D7.
Table 9 Pull-down control register
PU02
PU01
PU00
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 D7 pull-down control bit
Port E1 pull-down control bit
Port E0 pull-down control bit
Pull-down control register PU0
at reset : 0002
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
q Set source
POF instruction is executed
q 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(XIN) is counted to16384 times.
Stabilizing time a
POF instruction
is executed
A
f(XIN) oscillation
Return input
B
(RAM back-up
mode)
f(XIN) stop
Reset
(Stabilizing time a )
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