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HARDWARE CONFIGURATION
2-70
8-BIT SERIAL I/O
2.11 8-BIT SERIAL I/O
8-bit serial data transfer is possible by the clock synchronous method.
LSB first or MSB first can be selected for data transfer.
Four shift-clock modes (three internal and one external) can be selected.
Block Diagram
Internal data bus
2
3
SIOF
SIOE
SCKE
SOE
CKS1
CKS0
BDS
SST
(Shift direction)
⇒ ⇒ ⇒ ⇒ ⇒ ⇒
Serial data register (SDR)
SI input
synchronous
circuit
SO output
synchronous
circuit
Output enable
Output enable
Internal
clock pulse
Shift-clock counter
Control
circuit
Shift-clock
pulse select
Transfer
direction
select
Serial mode
register (SMR)
Overflow
D0 to D7
(MSB first)
D7 to D0
(LSB first)
P34/SI
P33/SO
P32/SCK
D7 to D0
IRQ8
Clear
Fig. 2.38 8-bit Serial I/O Block Diagram
Register list
The 8-bit serial I/O consists of serial mode register (SMR) and serial data
register (SDR).
Address: 001C
H
Address: 001D
H
SMR
SDR
R/W Serial mode register
R/W Serial data register
8 bit
Summary of Contents for F2MC-8L Series
Page 121: ...INSTRUCTIONS 4 7 4 5 F2MC 8L FAMILY INSTRUCTION MAP ...
Page 123: ...5 MASK OPTIONS ...
Page 125: ...APPENDIX ...