MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
PIN DESCRIPTION
Input/
Output
Pin
Name
Functions
VCC,
Apply voltage of 5 V ± 10 % (typical) to VCC and AVCC, and 0 V to VSS.
Power source
AVCC,
VSS
CNVSS
_____
Connected to VSS.
CNVSS
Input
Input
RESET
To enter the reset state, the reset input pin must be kept at a “L” for 2 µs or more (under
normal VCC conditions).
If more time is needed for the quartz-crystal oscillator to stabilize, this “L” condition should
be maintained for the required time.
Reset input
XIN
This chip has an internal clock generating circuit. To control generating frequency, an
external ceramic resonator or a quartz-crystal oscillator is connected between pins XIN and
XOUT. If an external clock is used, the clock source should be connected to the XIN pin and
the XOUT pin should be left open.
Clock input
XOUT
Clock output
Output
I/O
P00/PWM4–
P02/PWM6,
P03/DA,
P04/PWM0–
P07/PWM3
Port P0 is an 8-bit I/O port with direction register allowing each I/O bit to be individually
programmed as input or output. At reset, this port is set to input mode. The output structure
of P03 is CMOS output, that of P00–P02 and P04–P07 are N-channel open-drain output.
See notes at end of Table for full details of port P0 functions.
I/O port P0
Output
Output
Pin P03 is also used as 14-bit PWM output pin DA. The output structure is CMOS output.
DA output
Pins P00–P02 and P04–P07 are also used as PWM output pins PWM4–PWM6 and PWM0–
PWM3 respectively. The output structure is N-channel open-drain output.
8-bit PWM output
Port P1 is an 8-bit I/O port and has basically the same functions as port P0. The output
structure of P10 and P15–P17 is CMOS output, that of P11–P14 is N-channel open-drain
output.
I/O port P1
I/O
P10/OUT2,
P11/SCL1,
P12/SCL2,
P13/SDA1,
P14/SDA2,
P15,
Pin P10 is also used as OSD output pin OUT2. The output structure is CMOS output.
OSD output
Multi-master
Output
Output
2
Pin P11 is used as SCL1, SCL2, SDA1 and SDA2 respectively, when multi-master I C-
2
BUS interface is used. The output structure is N-channel open-drain output.
I C-BUS interface
P16/INT3,
P17/SIN
External interrupt
input
Input
Input
Pin P16 is also used as external interrupt input pin INT3.
Pin P17 is also used as serial I/O data input pin SIN.
Serial I/O data
input
I/O port P2
Analog input
I/O port P3
Port P2 is an 8-bit I/O port and has basically the same functions as port P0. The output
structure is CMOS output.
I/O
Input
I/O
P20–P23
P24/AD3–
P26/AD1,
P27/AD5
Pins P24–P26, P27 are also used as analog input pins AD3–AD1, AD5 respectively.
Ports P30 and P31 are 2-bit I/O ports and have basically the same functions as port P0.
The output structure is CMOS output.
P30, P31
Input port P4
Analog input
Ports P40–P46 are a 7-bit input port.
Input
Input
Input
P40/AD4,
P41/INT2,
P42/TIM2,
P43/TIM3,
P44/INT1,
P45/SOUT,
P46/SCLK
Pin P40 is also used as analog input pin AD4.
External interrupt
input
Pins P41, P44 are also used as external interrupt input pins INT2, INT1.
External clock input
Pins P42 and P43 are also used as external clock input pins TIM2, TIM3 respectively.
Input
Serial I/O data
output
Pin P45 is used as serial I/O data output pin SOUT. The output structure is N-channel open-
drain output.
Output
Serial I/O
synchronous clock
input/output
Pin P46 is used as serial I/O synchronous clock input/output pin SCLK. The output structure
is N-channel open-drain output.
I/O
P52/R,P53/G,
P54/B,
P55/OUT1
Output port P5
Ports P52–P55 are 4-bit output ports. The output structure is CMOS output.
Pins P52–P55 are also used as OSD output pins R, G, B, OUT1 respectively.
Output
Output
OSD output
6
RENESAS [ RENESAS TECHNOLOGY CORP ]
