UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 254

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

13.2 Configuration of Serial Interface
(1) Serial I/O shift register 3 (SIO3)
252
Serial interface SIO3 includes the following hardware.
Caution
This is an 8-bit register that performs parallel-serial conversion and serial transmit/receive (shift operations) in
synchronization with the serial clock.
SIO3 is set by an 8-bit memory manipulation instruction.
When bit 7 (CSIE3) of serial operation mode register 3 (CSIM3) is set to 1, a serial operation can be started by
writing data to or reading data from SIO3.
When transmitting, data written to SIO3 is output to the serial output (SO).
When receiving, data is read from the serial input (SI) and written to SIO3.
RESET input makes SIO3 undefined.
SCK/P51
SO/P53
SI/P52
Register
Control register
Do not access SIO3 during a transfer operation unless the access is triggered by a transfer
start (read operations are disabled when MODE = 0 and write operations are disabled when
MODE = 1).
Item
Figure 13-1. Block Diagram of Serial Interface 3
Table 13-1. Configuration of Serial Interface 3
CHAPTER 13 SERIAL INTERFACE SIO3
Serial I/O shift register 3 (SIO3)
Serial operation mode register 3 (CSIM3)
User’s Manual U13029EJ7V1UD
Internal bus
Serial clock
controller
Serial clock
counter
Configuration
Serial I/O shift register 3
(SIO3)
Interrupt
request signal
generator
Selector
INTCSI3
f
f
f
X
X
X
/2
/2
/2
6
7
8