Renesas R8C/Tiny Series Manuel télécharger pdf (Page 99)

R8C/10 Group 13. Serial Interface

Rev.1.20 Jan 27, 2006 page 89 of 180

REJ09B0019-0120

13. Serial Interface

Serial interface is configured with two channels: UART0 to UART1. UART0 and UART1 each have an

exclusive timer to generate a transfer clock, so they operate independently of each other.

Figure 13.1 shows a block diagram of UARTi (i=0, 1). Figure 13.2 shows a block diagram of the UARTi

transmit/receive.

UART0 has two modes:

clock synchronous serial I/O mode, and clock asynchronous serial I/O mode (UART

mode).

UART1 has only one mode,

clock asynchronous serial I/O mode (UART mode).

Figures 13.3 to 13.5 show the UARTi-related registers.

Figure 13.1 UARTi (i=0, 1) Block Diagram

Internal

External

Main clock or on-chip oscillator clock

Receive

clock

Transmit

clock

1SIO

1/8

8SIO

1/4

32SIO

1/2

CLK1 to CLK0=002

=012

=102

CKDIR=0

CKDIR=1

CLK0

(UART0)

RxD0

1SIO

1/(n0+1)

TxD

RxD1

CLK1 to CLK0=002

=012

=102

To P00

TxD10

TxD11

TXD1SEL=1

TXD1SEL=0

TXD1EN

1/(n1+1)

(UART1)

1/16

U0BRG register

8SIO

32SIO

1SIO

8SIO

32SIO

CLK

polarity

reversing

circuit

Clock synchronous type

(when internal clock is selected)

Clock synchronous type

(when external clock is selected)

UART reception

Clock synchronous

type

UART transmission

Clock synchronous

type

Clock synchronous type

(when internal clock is selected)

Reception

control circuit

Transmission control

circuit

Transmit/

receive

unit

UART reception

U1BRG

Internal

UART transmission

Reception

control circuit

Transmission

control circuit

Transmit/

receive

unit

Reception

control circuit

Transmission

control circuit

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 198 199

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Renesas R8C/Tiny Series Manuel Page 99

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