Panasonic MN103001G/F01K User Manual

Page 336

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Serial Interface

13-34

• One-byte transfer with 7-bit data length and parity on

Fig. 13-3-5 Timing Chart (15)

• Two-byte transfer with 8-bit data length and parity on

Fig. 13-3-6 Timing Chart (16)

After reception end (when the SCnRBF flag = “1”), the received data is fetched by reading the SCnRXB. In the

case of a 7-bit transfer, the MSB (bit 7) is “0”.

The SCnRXF flag is set to “1” at the start of reception (at the falling edge of SBT pin), and is set to “0” at the end
of reception.

The SCnRBF flag is set to “1” at the end of reception, and is set to “0” when SCnRXB is read.

Sending dummy data makes it possible to receive data while supplying the clock from the microcomputer side. In
this case, interrupt requests are also generated by the transmission source. Receive data according to the following

procedure:
(1) Select the internal clock as the reference clock, and set the parity, character length, etc.

(2) Enable both the transmission operation and the receiving operation.
(3) When dummy data is written to the transmission buffer, the clock is sent and reception begins.

When using clock synchronous mode (2), set the SBO pin as a general-purpose input port before writing the
dummy data to the transmission buffer, and then reset the pin as the SBO pin after transmission is complete.

bp1 bp2 bp3 bp4 bp5 bp6

bp0

bp1 bp2 bp3 bp4 bp5 bp6

bp0

bp7

SBI pin

SBT pin

Interrupt request

SCnRXF flag

SCnRBF flag

Data read

PTY

bp1

bp2

bp3

bp4

bp5

bp6

PTY

bp0