M38207E8FP Datasheet, PDF(25/66 Page) Mitsubishi Electric Semiconductor

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M38207E8FP Datasheet, PDF (25/66 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS

3820 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

SERIAL I/O1

Serial I/O1 can be used as either clock synchronous or asynchro-

nous (UART) serial I/O1. A dedicated timer (baud rate generator)

is also provided for baud rate generation.

Clock Synchronous Serial I/O1 Mode

Clock synchronous serial I/O1 mode can be selected by setting

the mode selection bit of the serial I/O1 control register to â1â.

For clock synchronous serial I/O1, 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 (address 001816).

P44/RXD

P46/SCLK1

f(XXIINN)

P47/SRDY1

P45/TXD

Data bus

Address 001816

Receive buffer register (RB)

Serial I/O1 control register Address 001A16

Receive buffer full flag (RBF)

Receive shift register

Serial I/O receive interrupt request (RI)

Shift clock

Clock control circuit

BRG count source selection bit

1/4

Serial I/O1 synchronization

clock selection bit

Frequency division ratio 1/(n+1)

Baud rate generator 1/4

Address 001C16

F/F

Falling-edge detector

Clock control circuit

Shift clock

Transmit shift register shift completion flag (TSC)

Transmit shift register

Transmit interrupt source selection bit

Serial I/O transmit interrupt request (TI)

Transmit buffer register (TB)

Address 001816

Data bus

Transmit buffer empty flag (TBE)

Serial I/O1 status register Address 001916

Fig. 15 Block diagram of clock synchronous serial I/O1

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 SRDY1

Write signal to receive/transmit

buffer register (address 001816)

TBE = 0

TBE = 1

TSC = 0

RBF = 1

TSC = 1

Overrun error (OE)

detection

Notes 1 : The serial I/O1 transmit interrupt (TI) can be selected to occur either when the transmit buffer register 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/O1 control register.

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

output continuously from the TxD pin.

3 : The serial I/O1 receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes â1â .

Fig. 16 Operation of clock synchronous serial I/O1 function

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