Synchronous Serial Interface (Sio1); Configuration - Philips CEM2100/00 Service Manual

14. Synchronous Serial Interface (SIO1)

The serial interfaces connect to an external device via SI1, SO1, and
When these pins are used as serial interface, the output latches for each port should be set to "1".

14.1 Configuration

SIO1SR
SIO1CR
Control circuit
Internal clock
INTSIO1
interrupt input
Note: Set the register of port correctly for the port assigned as serial interface pins.
For details, see the description of the input/output port control register.
Internal data bus
Shift clock
MSB/LSB
selection
Figure 14-1 Synchronous Serial Interface (SIO)
Page 159
pins.
SCK1
SIO1TDB
Shift register on transmitter
Port
(Note)
Port
(Note)
Shift register on receiver
SIO1RDB
To BUS
Port
(Note)
T5CL8
SO1 pin
(Serial data output)
SI1 pin
(Serial data input)
pin
SCK1
(Serial data output)