M3727GM6 Datasheet, PDF (8/129 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M3727GM6/M8–XXXSP/FP M37272E8SP/FP
Table 7.2 Pin Description (continued)
Pin
Name
P30/AD5, I/O port P3
P31/AD6
Analog input
P50/HSYNC, Input port P5
P51/VSYNC HSYNC input
VSYNC input
P52/R,
Output port P5
P53/G,
P54/B,
OSD output
P55/OUT1
CVIN
I/O for data slicer
VHOLD
HLF
Input/
Output
I/O
Input
Input
Input
Input
Output
Output
Input
Input
I/O
Functions
Ports P30 and P31 are a 2-bit I/O port and has basically the same functions as port 0.
The output structure can be selected either CMOS output or N-channel open-drain output
structure. (See notes 1, 3)
Pins P30 and P31 are also used as analog input pins AD5 and AD6 respectively.
Pin P50 and P51 are 2-bit input ports.
Pin P50 is also used as HSYNC input. This is a horizontal synchronous signal input for OSD.
Pin P51 is also used as VSYNC input. This is a vertical synchronous signal input for OSD.
Ports P52–P55 are a 4-bit output port. The output structure is CMOS output.
Pins P52–P55 are also used as OSD output pins R, G, B, OUT1 respectively. The output
structure is CMOS output.
Input composite video signal through a capacitor.
Connect a capacitor between VHOLD and Vss.
Connect a filter using of a capacitor and a resistor between HLF and Vss.
Notes 1: Port Pi (i = 0 to 3) has the port Pi direction register 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 LOW 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.
2: To switch output functions, set the raster color register and OSD control register. When pins P26 and P27 are used as the OSD clock input/output pins, set
the corresponding bits of the port P2 direction register to “0” (input mode).
3: To switch output structures, set bits 2 and 3 of the port P3 direction register, When “0,” CMOS output ; when “1,” N-channel open-drain output.
Rev.1.00 Apr 01, 2001 page 8 of 127
REJ03B0132-0100Z