M30620FCAFP datasheet(381/615 Pages) RENESAS

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Clock-Synchronous Serial I/O

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-64

2.4.3 Operation of the Serial I/O (transmission in clock-synchronous serial I/O

mode, transfer clock output from multiple pins function selected)

Note 1: This can be selected only when UART1 is used in combination with the internal clock. When this function is

_______ _______

selected, UART1 CTS/RTS function can not be utilized. Set the UART1 CTS/RTS disable bit to “1”.

Note 2: UART2 only.

(1) Setting the transmit enable bit to “1” makes data transmissible status ready.

(2) When transmission data is written to the UART1 transmit buffer register, transmission data

held in the UART1 transmit buffer register is transmitted to the UART1 transmit register in

synchronization with the first falling edge of the transfer clock. At this time, the first bit of the

transmission data is transmitted from the TxD1 pin. Then the data is transmitted bit by bit

from the lower order in synchronization with the falling edges of the transfer clock.

(3) When transmission of 1-byte data is completed, the transmit register empty flag goes to “1”,

which indicates that the transmission is completed. The transfer clock stops at “H” level. At

this time, the UART1 transmit interrupt request bit goes to “1”.

(4) Setting CLK/CLKS select bit 1 to “1” and setting CLK/CLKS select bit 0 to “1” causes the

CLKS1 pin to go to the transfer clock output pin. Change the transfer clock output pin when

transmission is halted.

Operation

Item

Set-up

Transfer clock

source

CLK polarity

Internal clock (f1 / f8 / f32)

External clock (CLKi pin)

CTS function

CTS function enabled

CTS function disabled

Output transmission data at

the falling edge of the

transfer clock

Output transmission data at

the rising edge of the

transfer clock

Transmission

interrupt factor

Transmission buffer empty

Transmission complete

Output transfer clock

to multiple pins

(Note 1)

Not selected

Selected

Transfer clock

LSB first

MSB first

Data logic select

function

(Note 2)

No reverse

Reverse

TXD, RXD I/O

polarity reverse bit

(Note 2)

No reverse

Reverse

In transmitting data in clock-synchronous serial I/O mode, choose functions from those listed in Table

2.4.2. Operations of the circled items are described below. Figure 2.4.10 shows the operation timing, and

Figures 2.4.11 and 2.4.12 show the set-up procedures.

Table 2.4.2. Choosed functions

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