M37221 Mitsubishi, M37221 Datasheet - Page 5

• Manufacturer Part Number: M37221
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

PIN DESCRIPTION (continued)
Note : As shown in the memory map (Figure 3), port P0 is accessed as a memory at address 00C0
P5
P5
P5
P5
H
V
D-A
SYNC
SYNC
2
3
4
5
/R,
/G,
/B,
/OUT1
direction register (address 00C1
programmed as “1” in the direction register are output pins. When pins are programmed as “0,” they are input pins. When pins are
programmed as output pins, the output data are written into the port latch and then output. When data is read from the output pins, the
output pin level is not read but the data of the port latch is read. This allows a previously-output value to be read correctly even if the
output “L” voltage has risen, for example, because a light emitting diode was directly driven. The input pins are in the floating state, so the
values of the pins can be read. When data is written into the input pin, it is written only into the port latch, while the pin remains in the
floating state.
Output port P5
CRT output
H
V
DA output
SYNC
SYNC
input
input
Output
Output
Output
Input
Input
16
of zero page) which can be used to program each bit as an input (“0”) or an output (“1”). The pins
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
Ports P5
Pins P5
structure is CMOS output.
This is a horizontal synchronizing signal input for CRT.
This is a vertical synchronizing signal input for CRT.
This is a 14-bit PWM output pin.
2
–P5
2
–P5
5
are also used as CRT output pins R, G, B, OUT1 respectively. The output
5
are a 4-bit output port. The output structure is CMOS output.
M37221EF-XXXSP,M37221EFSP
with ON-SCREEN DISPLAY CONTROLLER
16
of zero page. Port P0 has the port P0
5