M30218 Datasheet, PDF(109/179 Page) Mitsubishi Electric Semiconductor

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M30218 Datasheet, PDF (109/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

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Serial I/O2

Mitsubishi microcomputers

M30218 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Handshake Signal

There are five types of handshake signal : SSTB2 output, SBUSY2 input/output, and SRDY2 input/output.

(1) SSTB2 output signal

The SSTB2 output is a signal to inform an end of transmission/reception to the serial transfer destina-

tion. The SSTB2 output signal can be used only when the internal synchronous clock is selected. In the

initial status [ serial I/O initialization bit (bit 4 of address 034216) = â0â ], the SSTB2 output goes to âLâ

__________

(bits 2, 3 of address 034216=11), or the SSTB2 output goes to âHâ (bits 2, 3 of address 034216=10).

At the end of transmit/receive operation, after the all data of the serial I/O2 register (address 034616) is

_________

output from SOUT2, SSTB2 output is âHâ (or SSTB2 output is âLâ) in the period of 1 cycle of the transfer clock.

Furthermore, after 1 cycle, the serial transfer status flag (bit 5 of address 034416) is reset to â0â.

In the automatic transfer serial I/O mode, whether the SSTB2 output is to be output at an end of each 1-byte

data or after completion of transfer of all data can be selected by the SBUSY2 output â¢ SSTB2 output function

select bit (bit 4 of address 034416).

â¢Serial operation used SSTB2 output

Operation mode

Transfer clock

SSTB2 output timing

: 8-bit serial I/O mode

: Internal synchronous clock

: Each 1-byte data

Internal clock

Serial transfer status flag "1"

(bit 5 at address 034416) "0"

SCLK2i

(i=1, 2)(output)

"H"

SSTB2(output)

"L"

SOUT2

D0 D1 D2 D3 D4 D5 D6 D7

Tc : Internal synchronous clock is selected by bits 5 to 7 of address 034816