M38B53M4-059FP datasheet(129/355 Pages) MITSUBISHI

129 / 355 page

38B5 Group User’s Manual

APPLICATION

2-41

2.3 Serial I/O

Baud rate generator

b7 b6 b5 b4 b3 b2 b1 b0

Baud rate generator

(BRG: address 1616)

Undefined

Functions

At reset R W

Undefined

• Bit rate of the serial transfer is determined.

• This is the 8-bit counter and has the reload

The count source is divided by n+1 owing to

specifying a value n.

Fig. 2.3.8 Structure of UART control register

Fig. 2.3.7 Structure of Baud rate generator

(2)

Serial I/O2

UART control register

b7 b6 b5 b4 b3 b2 b1 b0

UART control register

(UARTCON: address 1716)

0: 8 bits

1: 7 bits

Name

Functions

At reset R W

0: Parity checking disabled

1: Parity checking enabled

0: Even parity

1: Odd parity

0: 1 stop bit

1: 2 stop bits

Character length

selection bit (CHAS)

Parity enable bit

(PARE)

Stop bit length

selection bit (STPS)

P55/TxD P-channel

output disable bit

(POFF)

Serial I/O2 clock

I/O pin selection bit

Parity selection bit

(PARS)

Nothing is arranged for this bit. This is a write

disabled bit. When this bit is read out, the

contents are “1”.

0: CMOS output (in output

mode)

1: N-channel open-drain

output (in output mode)

BRG clock switch bit 0: XIN or XCIN/2 (depending

on internal system clock)

1: XCIN

0: SCLK21 (P57/SCLK22 pin is

used as I/O port or SRDY2

output pin.)

1: SCLK22 (P56/SCLK21 pin is

used as I/O port.)

M38B53M4-059FP Datasheet(PDF) 129 Page - Mitsubishi Electric Semiconductor

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