NEC PD78078 用户手册

µ

To Internal
Circuit

SCK0/P27

P27 Output

Latch

When CSIE0 = 1

and

CSIM01 and CSIM00 are 1 and 0, or 1 and 1.

Set by bit manipulation 
instruction

SCK0 (1 when transfer stops)

From Serial Clock
Control Circuit

Because the SCK0/P27 pin incorporates an output latch, static output is also possible by software in addition

to normal serial clock output.

P27 output latch manipulation enables setting any value to SCK0 by software (SI0/SB0 and SO0/SB1 pin to be

controlled with the RELT and CMDT bits of the serial bus interface control register (SBIC)).

SCK0/P27 pin output manipulating procedure is described below.

  (1) Set the serial operating mode register 0 (CSIM0) (SCK0 pin enabled for serial operation in the output mode).

SCK0 = 1 with serial transfer suspended.

 (2) Manipulate the P27 output latch with a bit manipulation instruction.