M16CSLASH26 datasheet(144/239 Pages) RENESAS

144 / 239 page

Renesas Technology Corp.

Clock Asynchronous Serial I/O (UART) Mode

138

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.15.24. Typical transmit/receive timing in UART mode (used for SIM interface)

fi : frequency of BRG2 count source (f1SIO, f2SIO, f8SIO, f32SIO)

Transmit enable

bit(TE)

Transmit buffer

empty flag(TI)

Transmit register

empty flag (TXEPT)

D1 D2 D3

D5 D6 D7

Start

bit

Parity

bit

The above timing applies to the following settings :

* Parity is enabled.

* One stop bit.

* Transmit interrupt cause select bit = 1 .

Tc = 16 (n + 1) / fi

n : value set to BRG2

Transmit interrupt

request bit (IR)

D0 D1

D2 D3 D4 D5 D6

Shown in ( ) are bit symbols.

Transfer clock

Stop

bit

Data is set in UART2 transmit buffer register

An L level returns from TxD2 due to

the occurrence of a parity error.

The level is detected by the

interrupt routine.

The level is

detected by the

interrupt routine.

Receive enable

bit (RE)

Receive complete

flag (RI)

D0 D1 D2 D3 D4 D5 D6 D7

Start

bit

Parity

bit

RxD2

The above timing applies to the following settings :

* Parity is enabled.

* One stop bit.

* Transmit interrupt cause select bit = 0 .

Tc = 16 (n + 1) / fi

n : value set to BRG2

Receive interrupt

request bit (IR)

D0 D1

D2 D3 D4 D5 D6 D7

Shown in ( ) are bit symbols.

Transfer clock

Stop

bit

An L level returns from TxD2 due to

the occurrence of a parity error.

TxD2

Read to receive buffer

D0 D1 D2 D3 D4 D5 D6 D7

Signal conductor level

(Note)

D0 D1

D2 D3 D4 D5 D6 D7

D0 D1

D2 D3 D4 D5 D6 D7

D0 D1 D2

D3 D4 D5 D6 D7

TxD2

RxD2

Signal conductor level

(Note)

Note : Equal in waveform because TxD2 and RxD2 are connected.

Transferred from UART2 transmit buffer register to UART2 transmit register

Cleared to 0 when interrupt request is accepted, or cleared by software

Note : Equal in waveform because TxD2 and RxD2 are connected.

M16C/26 Datasheet(PDF) 144 Page - Renesas Technology Corp

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