HD404318 Datasheet, PDF (46/68 Pages) Hitachi Semiconductor – 4-bit HMCS400-series microcomputer

HD404318 Series
STS wait state
(Octal counter = 000,
transmit clock disabled)
MCU reset
SMR write
STS instruction
SMR write (IFS←1)
Transmit clock wait state
(Octal counter = 000)
Transmit clock
8 transmit clocks or STS instruction (IFS ← 1)
External clock mode
Transfer state
(Octal counter = 000)
SMR write
STS wait state
(Octal counter = 000,
transmit clock disabled)
MCU reset
Continuous clock output state
(PMRA 0, 1 = 0, 0)
SMR write
STS instruction
Transmit clock
Transmit clock wait state
(Octal counter = 000)
Transmit clock
STS instruction (IFS ← 1)
8 transmit clocks or
SMR write (IFS ←1)
Transfer state
(Octal counter = 000)
Internal clock mode
Figure 34 Serial Interface State Transitions
Transmit clock
Serial output
data
Serial input
data latch
timing
1
2
3
4
5
6
7
8
LSB
MSB
Figure 35 Serial Interface Timing
44