M30620ECFS datasheet(377/621 Pages) RENESAS

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UART

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

362

In receiving data in UART mode, choose functions from those listed in Table 2.5.5. Operations of the

circled items are described below. Figure 2.5.11 shows the operation timing, and Figures 2.5.12 and

2.5.13 show the set-up procedures.

2.5.3 Operation of Serial I/O (reception in UART mode)

Table 2.5.5. Choosed functions

Item

Set-up

Transfer clock

source

(Note 2)

Internal clock (f1 / f8 / f32)

External clock (CLKi pin)

RTS function

RTS function enabled

RTS function disabled

CTS / RTS

separation function

(Note 1)

Pin shared by CTS and RTS

CTS and RTS separate

Sleep mode

(Note 2)

Sleep mode off

Sleep mode selected

Item

Set-up

Data logic select

function

(Note 3)

No reverse

Reverse

TXD, RXD I/O

polarity reverse bit

(Note 3)

No reverse

Reverse

Bus collision

detection function

(Note 3)

Not selected

Selected

_______ ________

Note 1: UART0 only. (UART1 CTS/RTS function cannot be used when this function is selected.)

Note 2: UART0, UART1 only.

Note 3: UART2 only.

(1) Setting the receive enable bit to “1” readies data-receivable status. At this time, output from

________

the RTSi pin goes to “L” level to inform the transmission side that the receivable status is

ready.

(2) When the first bit (the start bit) of reception data is received from the RxDi pin, output from the

_______

RTS goes to “H” level. Then, data is received, bit by bit, in sequence: LSB, ····, MSB, and stop

bit(s).

(3) When the stop bit(s) is (are) received, the content of the UARTi receive register is transmitted

to the UARTi receive buffer register.

At this time, the receive complete flag goes to “1” to indicate that the reception is completed, the

_______

UARTi receive interrupt request bit goes to “1”, and output from the RTS pin goes to “L” level.

(4) The receive complete flag goes to “0” when the lower-order byte of the UARTi buffer register

is read.

Operation

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