PD17012_15 Datasheet, PDF (175/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
15.6 Presettable Shift Register (SIO1SFR)
The presettable shift register is an 8-bit shift register that writes serial out data and reads serial in data.
Data is written to or read from the presettable shift register via the data buffer by using the PUT or GET
instruction.
15.6.1 shows the configuration of the presettable shift register and its relationship with the data buffer.
The presettable shift register performs its shift operation in synchronization with the clock applied to the shift
clock (P0A2/SCK1) pin.
At this time, the contents of the most significant bit (MSB) of the presettable shift register are output to the
serial data output pin in synchronization with the fall of the shift clock, and the least significant bit (LSB) of the
presettable shift register is read in synchronization with the rise of the clock.
15.6.2 explains the points to be noted when writing or reading data to or from the presettable shift register.
The presettable shift register does not shift data in the wait status.
For details of the operation in each serial communication mode, refer to 15.8.
15.6.1 Configuration of presettable shift register and its relationship with data buffer
The configuration of the presettable shift register and its relationship with the data buffer are shown below.
Name
Data buffer
Symbol
DBF3
DBF2
DBF1
DBF0
Address
0CH
0DH
0EH
0FH
Bit
b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0 b3 b2 b1 b0
Data
Don't care
Don't care
Transfer data
Name
Presettable shift register
GET can be executed^Note
8
PUT can be executed^Note
Peripheral register
b7
b6
b5
b4
b3
b2
b1
b0 Symbol
Peripheral
address
M
L SIO1SFR 03H
Peripheral
hardware
Serial
S
S
interface
B
B
Valid data
Sets serial out data and reads serial
in data
D7 D6 D5 D4 D3 D2 D1 D0 D7←D6←D5←D4←D3←D2←D1←D0
Serial out
Serial in
Note If PUT or GET is executed in serial communication mode, data may be corrupted. For details, refer to 15.6.2
Notes on setting and reading data.
Data Sheet U10101EJ4V0DS
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