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D17133CS Datasheet(PDF) 152 Page - NEC

Part # D17133CS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  289 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

D17133CS Datasheet(HTML) 152 Page - NEC

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CHAPTER 13
PERIPHERAL HARDWARE
137
13.3.2 3-wire Serial Interface Operation Modes
Two modes can be used for the serial interface. If the serial interface function is selected, the P0D2/SI pin always
takes in data in synchronization with the serial clock.
• 8-bit send/receive mode (concurrent send/receive)
• 8-bit receive mode (SO pin: high-impedance state)
Table 13-3. Serial Interface's Operation Mode
SIOEN
SIOHIZ
P0D2/SI pin
P0D1/SO pin
Serial Interface Operation Mode
1
0
SI
SO
8-bit send/receive mode
1
1
SI
P0D1 (input)
8-bit receive mode
0
×
P0D2 (input/output) P0D1 (input/output)
General-purpose port mode
×: Don't care
(1) 8-bit transmission and reception mode (simultaneous transmission and reception)
Serial data input/output is controlled by a serial clock. The MSB of the shift register is output from the SO
line with a falling edge of the serial clock (SCK). The contents of the shift register is shifted one bit and at
the same time, data on the SI line is loaded into the LSB of the shift register.
The serial clock counter counts serial clock pulses. Every time it counts eight clocks, the interrupt request
flag is set (IRQSIO
← 1).
Figure 13-13. Timing of 8-Bit Transmission and Reception Mode
(Simultaneous Transmission Reception)
1
2
3
4
56
78
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
SCK pin
SO pin
IRQSIO
SI pin
Transmission starts in synchronization with the SCK pin falling edge.
An instruction which writes 1 into SIOTS is executed.
(Transmission start indication)
Transmission
completion
Remark
DIn
:
Serial input data
DOn :
Serial output data



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