參數(shù)資料
型號(hào)： M34570ED
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁數(shù)： 5/68頁
文件大小： 319K
代理商： M34570ED
5
MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MULTIFUNCTION
Pin
D
9
P2
1
Notes 1: Pins except above have just single function.
2: The port D
9
is the output port and port P2
1
is the input port.
Multifunction
T
OUT
INT
Multifunction
D
9
P2
1
Pin
T
OUT
INT
CONNECTIONS OF UNUSED PINS
Pin
D
0
–D
8
D
9
/T
OUT
P0
0
–P0
3
P1
0
–P1
3
P2
0
, P2
1
/INT
Notes 1: When the P2
1
/INT pin is connected to V
SS
pin, set the return level to “H” level by software (interrupt control register I1
2
=“1”).
When the P2
1
/INT pin is connected to V
SS
pin while the return level is set to “L” level, system returns from RAM back-up
state immediately after system enters the RAM back-up state.
2: In order to connect ports P4
0
–P4
3
to V
SS
, turn off their pull-up transistors (pull-up control register PU0i=“0”) by software and
also invalidate the key-on wakeup functions (key-on wakeup control register K0i=“0”). When these pins are connected to
V
SS
while the key-on wakeup functions are left valid, the system fails to return from RAM back-up state. In order to make
these pins open, turn on their pull-up transistors (register PU0i=“1”) by software (i = 0, 1, 2, 3).
Be sure to select the key-on wakeup function and the pull-up function with every one port.
3: In order to make ports P4
0
–P4
3
open, turn on their pull-up transistors (register PU0i = “1”) by software (i = 0, 1, 2, 3).
Connection
Connect to V
SS
, or set the output latch to
“0” and open.
Set the output latch to “1” and open.
Connect to V
SS
(Note 1).
Connection
Connect to V
SS
, or set the output latch to
“0” and open.
Connect to V
SS
(Note 2) or open (Note 3).
Open.
Pin
P3
0
–P3
3
P4
0
–P4
3
CARR
(Note in order to set the output latch to “0” or “1” or make pins open)
After system is released from reset, a port is in a high-impedance state until the output latch of the port is set to “0” by software.
Accordingly, the voltage level of pins is undefined and the excess of the supply current may occur.
To set the output latch periodically is recommended because the value of output latch may change by noise or a program run away
(caused by noise).
(Note in order to connect unused pins to V
SS
)
To avoid noise, connect the unused pins to V
SS
at the shortest distance using a thick wire.
PORT FUNCTION
Port
Port D
Port P0
Port P1
Port P2
Port P3
Port P4
Control
bits
1
4
4
2
4
4
Control
instructions
SD
RD
CLD
OP0A
IAP0
OP1A
IAP1
IAP2
SNZI0
(Note)
OP3A
IAP3
IAP4
Control
registers
W2
2
PU0
K0
Output structure
N-channel open-drain
N-channel open-drain
N-channel open-drain
N-channel open-drain
Remark
Pull-up functions
Key-on wakeup functions
Pull-up functions
Key-on wakeup functions
Key-on wakeup function
Pull-up functions
(programmable)
Key-on wakeup functions
(programmable)
W2
2
controls the switch of D
9
/
T
OUT
pin
Note: Level of the P2
1
/INT pin can be examined with the SNZI0 instruction.
Pin
D
0
–D
8
, D
9
/T
OUT
P0
0
–P0
3
P1
0
–P1
3
P2
0
P2
1
/INT
P3
0
–P3
3
P4
0
–P4
3
Input/
Output
Output
(10)
I/O
(4)
I/O
(4)
Input
(2)
I/O
Input
(4)
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