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Chapter 10 Clock Synchronous Serial Interface
10
Fig. 10-9 Block Diagram of Clock Synchronous Serial Interface
Internal bus
D
CLS1CLS0
f
CLK
/32
f
CLK
/8
INTCSI
Interrupt
signal
generator
circuit
Bus release/command/
acknowledge detector
circuit
Serial clock counter
Serial clock control
circuit
N-ch open-drain
output enabled

Selector

P32/SCK
P33/SO/SB0
P27/SI
RESET CTXE CRXE WUP MOD1 CLS1 CLS0
1/8
CSIM
ACKTCMDDRELDCMDTRELT ACKE ACKD BSYE
1/8
SBIC
8
Shift register SIO
RESET
Busy/
acknowledge
output circuit
QSO latch
SET
CLEAR
CLS1
CLS0
MPX
8-bit timer/counter 3 output
1/2