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M38B71M1 Datasheet(PDF) 40 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 40 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
39
[Serial I/O2 Control Register] SIO2CON (001D16)
The serial I/O2 control register contains eight control bits for serial
I/O2 functions.
[UART Control Register] UARTCON (003816)
This is a 7 bit register containing four control bits, of which four
bits are valid when UART is selected, and of which three bits are
always valid.
Data format of serial data receive/transfer and the output structure
of the P65/TxD pin and others are set by this register.
[Serial I/O2 Status Register] SIO2STS (001E16)
The read-only serial I/O2 status register consists of seven flags
(b0 to b6) which indicate the operating status of the serial I/O2
function and various errors. Three of the flags (b4 to b6) are only
valid in the UART mode. The receive buffer full flag (b1) is cleared
to “0” when the receive buffer is read.
The error detection is performed at the same time data is trans-
ferred from the receive shift register to the receive buffer register,
and the receive buffer full flag is set. A writing to the serial I/O2
status register clears error flags OE, PE, FE, and SE (b3 to b6, re-
spectively). Writing “0” to the serial I/O2 enable bit (SIOE : b7 of
the serial I/O2 control register) also clears all the status flags, in-
cluding the error flags.
All bits of the serial I/O2 status register are initialized to “0” at re-
set, but if the transmit enable bit (b4) of the serial I/O2 control
register has been set to “1”, the transmit shift register shift comple-
tion flag (b2) and the transmit buffer empty flag (b0) become “1”.
[Serial I/O2 Transmit Buffer Register/Receive
Buffer Register] TB/RB (001F16)
The transmit buffer and the receive buffer are located in 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”.
[Baud Rate Generator] BRG (003716)
The baud rate generator determines the baud rate for serial trans-
fer. With the 8-bit counter having a reload register, 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.


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