M3727GM6 datasheet(8/129 Pages) RENESAS

Part #	M3727GM6

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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M3727GM6/M8–XXXSP/FP M37272E8SP/FP

Rev.1.00

Apr 01, 2001

page 8 of 127

REJ03B0132-0100Z

Name

Input/

Functions

Output

P30/AD5,

I/O port P3

I/O

Ports P30 and P31 are a 2-bit I/O port and has basically the same functions as port 0.

P31/AD6

The output structure can be selected either CMOS output or N-channel open-drain output

structure. (See notes 1, 3)

Analog input

Input

Pins P30 and P31 are also used as analog input pins AD5 and AD6 respectively.

P50/HSYNC,

Input port P5

Input

Pin P50 and P51 are 2-bit input ports.

P51/VSYNC

HSYNC input

Input

Pin P50 is also used as HSYNC input. This is a horizontal synchronous signal input for OSD.

VSYNC input

Input

Pin P51 is also used as VSYNC input. This is a vertical synchronous signal input for OSD.

P52/R,

Output port P5

Output

Ports P52–P55 are a 4-bit output port. The output structure is CMOS output.

P53/G,

P54/B,

OSD output

Output

Pins P52–P55 are also used as OSD output pins R, G, B, OUT1 respectively. The output

P55/OUT1

structure is CMOS output.

CVIN

I/O for data slicer

Input

Input composite video signal through a capacitor.

VHOLD

Input

Connect a capacitor between VHOLD and Vss.

HLF

I/O

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.

Table 7.2 Pin Description (continued)

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