M37510M1FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M37510M1FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

Serial I/O Control Register

SIO1CON (001A16), SIO2CON (003216)

The serial I/O control register consists of eight control bits for the

serial I/O function.

UART Control Register

UART1CON (001B16), UART2CON (003316)

The UART control register consists of four control bits (bits 0 to 3)

which are valid when asynchronous serial I/O is selected and set

the data format of an data transfer. One bit in this register (bit 4) is

always valid and sets the output structure of the P45/TXD1 (P31/

TXD2) pin.

Serial I/O Status Register

SIO1STS (001916), SIO2STS (003116)

The read-only serial I/O status register consists of seven flags

(bits 0 to 6) which indicate the operating status of the serial I/O

function and various errors.

Three of the flags (bits 4 to 6) are valid only in UART mode.

The receive buffer full flag (bit 1) is cleared to “0” when the receive

buffer is read.

If there is an error, it is detected at the same time that data is

transferred from the receive shift register to the receive buffer, and

the receive buffer full flag is set. Writing to the serial I/O status reg-

ister clears all the error flags OE, PE, FE, and SE (bit 3 to bit 6,

respectively). Writing “0” to the serial I/O enable bit SIOE (bit 7 of

the serial I/O control register) also clears all the status flags, in-

cluding the error flags.

All bits of the serial I/O status register are initialized to “0” at reset,

but if the transmit enable bit (bit 4) of the serial I/O control register

has been set to “1”, the transmit shift completion flag (bit 2) and

the transmit buffer empty flag (bit 0) become “1”.

Transmit Buffer Register/Receive Buffer Register

TB1/RB1 (001816), TB2/RB2 (003016)

The transmit buffer register and the receive buffer register are lo-

cated at the same address. The transmit buffer register is

write-only and the receive buffer register is read-only.

If a character bit length is 7 bits, the MSB of data stored in the re-

ceive buffer register is “0”.

Baud Rate Generator

BRG1 (001C16), BRG2 (003416)

The baud rate generator determines the baud rate for serial trans-

fer.

The baud rate generator divides the frequency of the count source

by 1/(n+1), where n is the value written to the baud rate generator.

MITSUBISHI MICROCOMPUTERS

7510 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

20

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