M37225M6_15 datasheet(29/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 27 of 124

REJ03B0136-0100Z

8.5 SERIAL I/O

This microcomputer has a built-in serial I/O which can either transmit

or receive 8-bit data serially in the clock synchronous mode.

The serial I/O block diagram is shown in Figure 8.5.1. The synchro-

nous clock I/O pin (SCLK), and data output pin (SOUT) also function

as port P4, data input pin (SIN) also functions as port P2.

Bit 3 of the serial I/O mode register (address 00DC16) selects whether

the synchronous clock is supplied internally or externally (from the

SCLK pin). When an internal clock is selected, bits 1 and 0 select

whether f(XIN) or f(XCIN) is divided by 4, 16, 32, or 64. To use SIN pin

for serial I/O, set the corresponding bit of the port P2 direction regis-

ter (address 00C516) to “0.”

Fig. 8.5.1 Serial I/O Block Diagram

The operation of the serial I/O is described below. The operation of

the serial I/O differs depending on the clock source; external clock or

internal clock.

8

Serial I/O shift register (8)

Data bus

Serial I/O

interrupt request

Synchronous

circuit

Frequency divider

1/32

1/4

1/64

SM1

SM0

Serial I/O counter (8)

SM5 : LSB

MSB

S

SM2

1/2

SM6

XIN

SIN

SOUT

SCLK

1/2

SM3

P21 latch

P20 latch

SM3

(Address 00DD16)

(See note)

SM : Serial I/O mode register

Note : When the data is set in the serial I/O register (address 00DD16), the register functions as the serial I/O shift register.

Selection gate : Connected to

black side at

reset

1/16

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