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Chapter 11    Serial Interface 0, 1

XI - 58

Operation

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Transmission / Reception Setup

The setup example at UART transmission / reception with serial 0 is shown.

Table 11-3-33 shows the conditions at transmission / reception.

An example setup procedure, with a description of each step is shown below.

Setup Procedure

Description

(1)

Select prescaler operation.

PSCMD (x'3F6F')

bp0 : PSCEN = 1

(2)

Select the clock source.

SC0CKS (x'3F97')

bp2-0 : SC0PSC2-0 = 110

(3)

Select the used pin.

SC0ODC (x'3F96')

bp7 : SC0SEL = 0

(4)

Control the pin type.

SC0ODC (x'3F96')

bp0 : SC0ODC0 = 1

P0PLU (x'3F40')

bp3 : P0PLU3  = 1

(5)

Control the pin direction.

P0DIR (x'3F30')

bp4-3 : P0DIR4-3 = 01

(1)

Set the PSCEN flag of the PSCMD register to

"1" to select prescaler operation.

(2)

S e t   t h e   b p 2 - 0   f l a g   o f   t h e   S C 0 C K S

register to "110" to select timer 4 output as a

clock source.

(3)

Set the SC0SEL flag of the  SC0ODC

register to "0" to set I/O used pin to A (port 0).

(4)

Set the SC0ODC0 flag of the SC0ODC

register to "1" to select N-ch open drain for the

TXD0A pin. Set the P0PLU3 flag of the P0PLU

register to "1" to add pull-up resistor.

(5)

Set the P0DIR4-3 flag of the port 0 pin direction

control register (P0DIR) to "01" to set P03 to

output mode, and P04 to input mode.

Setup item

set to

TXD / RXD pin

independent (with 2 channels)

Frame mode specification

8 bits + 2 stop bits

Firs t transfer bit

MSB

Clock source

timer 5

Used pin

A (Port 0)

TXD0A / RX0DA pin type

Nch open-drain

Pull-up resistor of TXD0A pin

added

Parity bit add / check

"0"add / check

Serial interface 0 trans mission
complete interrupt

Enable.

Serial interface 0 reception
complete interrupt

Enable.