M34282E2GP MITSUBISHI [Mitsubishi Electric Semiconductor], M34282E2GP Datasheet - Page 20

• Manufacturer Part Number: M34282E2GP
• Description: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Note: “W” represents write enabled.
Table 8 Return source and return condition
(5) Pull-down control register
Table 9 Pull-down control registers
20
(4) Return signal
Ports D
Ports E
Ports E
PU1
PU1
PU1
PU1
PU0
PU0
PU0
PU0
Registers PU0 and PU1 are 4-bit registers and control the
ON/OFF of pull-down transistor and key-on wakeup function
for ports E
An external wakeup signal is used to return from the RAM
back-up mode. Table 8 shows the return condition for each
return source.
Return source
3
2
1
0
3
2
1
0
0
2
4
, E
–D
Pull-down control register PU1
Pull-down control register PU0
Ports G
bit
Ports G
bit
Port E
Port E
Port D
Port D
Port D
Port D
1
7
, G
0
, E
1
1
0
7
6
5
4
, G and ports D
2
0
pull-down transistor control bit
pull-down transistor control bit
pull-down transistor control bit
pull-down transistor control bit
pull-down transistor control bit
pull-down transistor control bit
, G
, G
3
1
Return by an external “H” level
input.
Return by an external “H” level
input.
Return by an external “H” level
input.
pull-down transistor control
pull-down transistor control
4
–D
Return condition
7
.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Only key-on wakeup function of the port whose pull-down transistor is
turned ON by register PU1 is valid.
Only key-on wakeup function of the port whose pull-down transistor is
turned ON by register PU0 is valid.
Key-on wakeup function is always valid.
at reset : 0000
MITSUBISHI
ELECTRIC
at reset : 0000
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
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
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
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
Set the contents of register PU0 or PU1 through register A
with the TPU0A or TPU1A instruction, respectively.
2
2
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
at RAM back-up : state retained
at RAM back-up : state retained
MITSUBISHI MICROCOMPUTERS
Remarks
4282 Group
W
W