SERIAL I/O INTERFACE KS57C2308/P2308/C2316/P2316

13-2

* Instruction Execution
fxx: System Clock
INTERNAL BUS
LSB or MSB first
SBUF (8-BIT)SI
CLOCK
SELECTOR
R
QD
TOL0
CPU CLK
fxx/2
fxx/2
R
S
Q
SO
SMOD.7 SMOD.6 SMOD.5 SMOD.3 SMOD.2 SMOD.1 SMOD.0
Q0 Q1 Q2
3-BIT COUNTER
CLEAR
OVERFLOW
IRQS
CK
8
INTERNAL BUS
BITS*
8
-
P0.1/ SCK
10
4

Figure 13-1. Serial I/O Interface Circuit Diagram