M37510M6 Datasheet, PDF(18/43 Page) Mitsubishi Electric Semiconductor

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M37510M6 Datasheet, PDF (18/43 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS

7510 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

SERIAL I/O

The 7510 group has two built-in serial I/O channels (serial I/O1

and serial I/O2). Both serial I/O ports are functionally identical.

Serial I/O can be used as either clock synchronous or asynchro-

nous (UART) serial I/O. A dedicated timer (baud rate generator) is

also provided for baud rate generation.

Clock Synchronous Serial I/O Mode

Clock synchronous serial I/O mode can be selected by setting the

mode selection bit of the serial I/O control register (addresses

001A16 and 003216) to â1â.

For clock synchronous serial I/O, the transmitter and the receiver

must use the same clock. If an internal clock is used, transfer is

started by a write signal to the TB/RB (addresses 001816 and

003016).

Data bus

P44/RXD1

P30/RXD2

Address 001816 003016 Serial I/O control register Address 001A16 003216

Receive buffer

Receive buffer full flag (RBF)

Receive shift register

Shift clock

Receive interrupt request (RI)

Clock control circuit

P46/SCLK1

P32/SCLK2

f(XIN)

BRG count source selection bit

1/4

Serial I/O

synchronous clock selection bit

Frequency division ratio 1/(n+1)

Baud rate generator 1/4

Address 001C16 003416

P47/SRDY1

P33/SRDY2

P45/TXD1

P31/TXD2

F/F

Falling-edge detector

Clock control circuit

Shift clock

Transmit shift completion flag (TSC)

Transmit shift register

Transmit interrupt source selection bit

Transmit interrupt request (TI)

Transmit buffer register

Address 001816

003016

Data bus

Transmit buffer empty flag (TBE)

Serial I/O status register Address 001916 003116

Contents in are for serial I/O2.

Fig. 13 Block diagram of clock synchronous serial I/O

Internal clock Ï

Transfer shift clock

(1/2 to 1/2048 of the internal

clock, or an external clock)

Serial output TXD

Serial input RXD

Receive enable signal SRDY

Write signal to

receive/transmit buffer

TBE = 0 TBE = 1

TSC = 0

RBF = 1

TSC = 1

Overrun error (OE) detection

Notes 1 : The transmit interrupt (TI) can be selected to occur either when the transmit buffer has emptied (TBE = 1) or after the transmit shift

operation has ended (TSC = 1), by setting the transmit interrupt source selection bit (TIC) of the serial I/O control register.

2 : If data is written to the transmit buffer when TSC = 0, the transmit clock is generated continuously and serial data is output continuously

from the TXD pin.

3 : The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes â1â.

Fig. 14 Operation of clock synchronous serial I/O function

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