HD404669 Datasheet, PDF (78/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
Octal counter
(OC1)
Serial 1 interrupt
request flag (IFS1)
SO₁
Idle control
logic
SCK₁
I/O control
logic
SI₁
Clock
Serial data
register 1
(SR1L, SR1U)
System ^{ø PER}
clock
1/2
÷2
1/2
÷8
÷32
÷128
÷512
÷2048
Data bus
Clock line
Signal line
Serial mode register
1A (SM1A)
Serial mode register
1B (SM1B)
Figure 58 Block Diagram of Serial Interface
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