M37225M6_15 datasheet(30/128 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 28 of 124

REJ03B0136-0100Z

Internal clock : The serial I/O counter is set to “7” during the write

cycle into the serial I/O register (address 00DD16), and the 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 register is shifted 1 bit.

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.”

Fig. 8.5.2 Serial I/O Timing (for LSB first)

Synchronous clock

Transfer clock

Serial I/O register

write signal

Serial I/O output

SOUT

D0

D1

D2

D3

D4

D5

D6

D7

(Note)

Serial I/O input

SIN

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

Interrupt request bit is set to “1”

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

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

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 8.5.2. When using an exter-

nal clock for transfer, the external clock must be held at HIGH for

initializing the serial I/O counter. When switching between an inter-

nal clock and an external clock, do not switch during transfer. Also,

be sure to initialize 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 instructions, such as SEB

and CLB.

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

mit data to the serial I/O register when the transfer clock input level is

HIGH.

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