M37207M8-059SP datasheet(25/121 Pages) MITSUBISHI

25 / 121 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

SERIAL I/O

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

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

The serial I/O block diagram is shown in Figure 18. The synchronous

clock I/O pin (SCLK), and data I/O pins (SOUT, SIN), receive enable

____

signal output pin (SRDY) also function as port P4.

Bit 2 of the serial I/O mode register (address 00DE16) selects whether

the synchronous clock is supplied internally or externally (from the

pins SCLK1, SCLK2). When an internal clock is selected, bits 1 and 0

select whether f(XIN) or f(XCIN) is divided by 8, 16, 32, or 64. To use

pins for serial I/O, set the corresponding bits of the port P4 direction

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

differs depending on the clock source; external clock or internal clock.

Fig. 18. Serial I/O Block Diagram

Serial I/O shift register (8)

Data bus

Serial I/O

interrupt request

Selection gate : Connected to

black side at

reset.

Synchronous

circuit

Frequency divider

1/8

1/4

1/16

SM1

SM0

Serial I/O counter (8)

SM5 : LSB

MSB

SM2

1/2

XIN

1/2

(Address 00DF16)

XCIN

CM7

1/2

(Note)

Note : When the data is set in the serial I/O register (address 00DF 16), the register functions as the serial I/O shift register.

P43 latch

SM6

SCL2 CSIO

SRDY2

SCLK2

SOUT2

SM4

P41 latch

SM7

SCL3

SM3

CSIO

P40 latch

SM7

SDA3

SM3

CSIO

SM6

P40 latch

SDA2

SIN2

SRDY1

P47 latch

SIC3

PWM8

SIC7

SCLK1

P45 latch

SIC4

SCL1

SIC5

SOUT1

P44 latch

SIC4

SDA1

SIC5

SIN1

SIC6

PWM9

P46 latch

CSIO

CM : CPU mode register

SM : Serial I/O mode register

SIC : Serial I/O control register

CSIO : Bit 1 of serial I/O control register

M37207M8-059SP Datasheet(PDF) 25 Page - Mitsubishi Electric Semiconductor

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