4570 Datasheet, PDF (5/69 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
Name
VDD
Power supply
VSS
Ground
CNVSS
CNVSS
RESET
Reset input
XIN
XOUT
D0–D9
Clock input
Clock output
Output port D
P00–P03 I/O port P0
P10–P13 I/O port P1
P20, P21
P30–P33
Input port P2
I/O port P3
P40–P43 Input port P4
CARR
INT
Carrier wave output
for remote control
Interrupt input
TOUT
Timer output
VDCE
Voltage drop
detection circuit
enable
Input/Output
—
—
Input
I/O
Input
Output
Output
I/O
I/O
I/O
I/O
Input
Output
Input
Output
Input
Function
Connected to a plus power supply.
Connected to a 0 V power supply.
Connect CNVSS to VSS and apply “L” (0V) to CNVSS certainly.
An N-channel open-drain I/O pin for a system reset. A pull-up transistor and a
capacitor are built-in this pin. When the watchdog timer causes the system to be
reset or the low-supply voltage is detected, the RESET pin outputs “L” level.
I/O pins of the clock generating circuit. Connect a ceramic resonator between XIN
pin and XOUT pin. A feedback resistor is built-in between them.
Each pin of port D has an independent 1-bit wide output function. Port D9 is also
used as TOUT output pin. The output structure is N-channel open-drain.
4-bit I/O port. It can be used as an input port when the output latch is set to “1.”
The output structure is N-channel open-drain. Every pin of the ports has a key-on
wakeup function and a pull-up function.
4-bit I/O port. It can be used as an input port when the output latch is set to “1.”
The output structure is N-channel open-drain. Every pin of the ports has a key-on
wakeup function and a pull-up function.
2-bit input port. Port P21 is also used as the INT input pin.
4-bit I/O port. It can be used as an input port when the output latch is set to “1.”
The output structure is N-channel open-drain.
4-bit input port. Every pin of the ports has a key-on wakeup function and a pull-up
function. Both functions can be switched by software.
Carrier wave output pin for remote control transmit. The output structure is the
CMOS circuit.
INT input pin accepts an external interrupt and has a key-on wakeup function. INT
input pin is also used as port P21.
TOUT output pin has the function to output the timer 2 underflow signal divided by
2. TOUT output pin is also used as port D9.
VDCE pin is used to control the operation/stop of the voltage drop detection circuit.
The circuit is operating when “H” level is input to the VDCE pin. It is stopped when
“L” level is input to this pin.
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