M30245 datasheet(86/367 Pages) RENESAS

86 / 367 page

Rev.2.00 Oct 16, 2006

page 77 of 354

REJ09B0340-0200

M30245 Group

2. SIM interface

In receiving data in UARTi (i=0 to 3) mode (used for SIM interface), choose functions from those listed in

Table 2.4.7. Operations of the circled items are described below. Figure 2.4.16 shows the operation

timing, and Figures 2.4.17 to 2.4.18 show the set-up procedures.

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

Table 2.4.7. 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 RxDi (i=0 to 3) pin, 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 (i=0 to 3) receive register is

transmitted to the UARTi (i=0 to 3) receive buffer register.

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

and the UARTi (i=0 to 3) receive interrupt request bit goes to “1”.

(4) The receive complete flag goes to “0” when the lower-order byte of the UARTi (i=0 to 3) buffer

(5) When the parity error is occurred, TXDi (i=0 to 3) pin goes to “L” level.

• Set the RxDi and CLKi pins' port direction register to “0”.

• Select N-channel open drain output for TxDi (i=0 to 3) pin with data output select bit of UARTi

(i=0 to 3) transmit/receive control register 0.

Operation

Note

Item

Set-up

Transfer data

format

Direct format

Inverse format

Item

Set-up

Transfer clock

source

Internal clock (f1/f8/f32)

External clock (CLKi pin)

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