M37207MF datasheet(27/122 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 19. Serial I/O Timing (for LSB first)

____

Internal clock : The SRDY signal goes to HIGH during the write cycle

by writing data into the serial I/O register (address 00DD16). After the

____

write cycle, the SRDY signal goes to “L” (receive enable state). The

____

SRDY

signal goes to “H” at the next falling edge of the transfer clock

for the serial I/O register.

The serial I/O counter is set to “7” during write cycle into the serial I/

O register (address 00DD16), and transfer clock goes HIGH forcibly.

At each falling edge of the transfer clock after the write cycle, serial

data is output from the SOUT pin. Transfer direction can be selected

by bit 5 of the serial I/O mode register. At each rising edge of the

transfer clock, data is input from the SIN pin and data in the serial I/O

After the transfer clock has counted 8 times, the serial I/O counter

becomes “0” and the transfer clock stops at HIGH. At this time the

interrupt request bit is set to “1.”

External clock : When an external clock is selected as the clock source,

the interrupt request is set to “1” after the transfer clock has counted

8 counts. However, transfer operation does not stop, so the clock

should be controlled externally. Use the external clock of 1 MHz or

less with a duty cycle of 50%.

The serial I/O timing is shown in Figure 19. When using an external

clock for transfer, the external clock must be held at “H” for initializing

the serial I/O counter. When switching between an internal clock and

an external clock, do not switch during transfer. Also, be sure to ini-

tialize the serial I/O counter after switching.

Notes 1: On programming, note that the serial I/O counter is set by

writing to the serial I/O register with the bit managing in-

structions such as SEB and CLB.

2: When an external clock is used as the synchronous clock,

write transmit data to the serial I/O register when the trans-

fer clock input level is HIGH.

Synchronous clock

Transfer clock

Serial I/O register

write signal

Serial I/O output

SOUT

(See note)

Serial I/O input

SIN

Note : When an internal clock is selected, the S OUT pin is at high-impedance after transfer is completed.

Interrupt request bit is set to “1”

Receive

signal

enable

SRDY

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