M38C2XMX datasheet(32/63 Pages) MITSUBISHI

32 / 63 page

38C2 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

[Transmit Buffer Register/Receive Buffer Reg-

ister (TB/RB)]

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

cated at the same address. The transmit buffer is write-only and the

receive buffer is read-only. If a character bit length is 7 bits, the MSB

of data stored in the receive buffer is “0”.

[Serial I/O Status Register (SIO1STS, SIO2STS)]

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 register is read.

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

ferred from the receive shift register to the receive buffer register,

and the receive buffer full flag is set. A write to the serial I/O status

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, including

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”.

[Serial I/O Control Register (SIO1CON, SIO2CON)]

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

serial I/O function.

[UART Control Register (UART1CON, UART2CON)]

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 and one bit (bit 4) which is always

valid and sets the output structure of the P55/TXD1 [P32/TxD2] pin.

[Baud Rate Generator (BRG1, BRG2)]

The baud rate generator determines the baud rate for serial transfer.

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.

M38C2XMX Datasheet(PDF) 32 Page - Mitsubishi Electric Semiconductor

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