M30620FCAFP datasheet(413/615 Pages) RENESAS

413 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-96

UART

In receiving data in UART mode (used for SIM interface), choose functions from those listed in Table

2.5.7. Operations of the circled items are described below. Figure 2.5.17 shows the operation timing, and

Figures 2.5.18 and 2.5.19 show the set-up procedures.

2.5.5 Operation of Serial I/O (reception used for SIM interface)

Figure 2.5.7. Choosed functions

(1) Setting the transmit enable bit and receive enable bit to “1” readies data-receivable status.

(2) When the first bit (the start bit) of reception data is received from the RxD2 pin, data is re-

ceived, bit by bit, in sequence: LSB, ····, MSB, and stop bit(s).

(3) When the stop bit(s) is (are) received, the content of the UART2 receive register is transmit-

ted to the UART2 receive buffer register.

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

_______

the UART2 receive interrupt request bit goes to “1”, and output from the RTS pin goes to “H”

level.

(4) The receive complete flag goes to “0” when the lower-order byte of the UART2 buffer register

is read.

(5) When the parity error is occurred, TXD2 pin goes to “L” level.

Operation

Item

Set-up

Transfer data

format

Direct format

Inverse format

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