MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
PIN DESCRIPTION (continued)
P6
0
–P6
2
,
P6
5
–P6
7
Output port
Output
Input
Input
Output
Output
Input
Input
Input
Ports P6
0
–P6
2,
P6
5
–P6
7
are a 6–bit output port. The output structure is N-channel open-
drain output.
Ports P6
3
and P6
4
are 2-bit input port.
P6
3
pin is also used as OSD clock input pin OSC1.
P6
4
pin is also used as OSD clock output pin OSC2. The output structure is CMOS output.
P6
4
pin is also used as sub-clock output pin X
COUT
. The output structure is CMOS output.
P6
3
pin is also used as sub-clock input pin X
CIN
.
Input composite video signal through a capacitor.
Connect a capacitor between V
HOLD
and V
SS
.
Connect a resistor between RVCO and V
SS
.
Connect a filter using of a capacitor and a resistor between HLF and V
SS
.
H
SYNC
input
V
SYNC
input
Input
Input
This is a horizontal synchronizing signal input for OSD.
This is a vertical synchronizing signal input for OSD.
P6
3
/OSC1/ Input port
X
CIN
,
Clock input for OSD
P6
4
/OSC2/
Clock output for OSD
X
COUT
Sub-clock output
Sub-clock input
CV
IN
V
HOLD
RVCO
HLF
H
SYNC
V
SYNC
I/O for data slicer
Note :
As shown in the memory map (Figure 3), port P0 is accessed as a memory at address 00C0
16
of zero page. Port P0 has the port P0
direction register (address 00C1
16
of zero page) which can be used to program each bit as an input (“0”) or an output (“1”). The pins
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.
7
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
