Z08617 NMOS Z8
®
8-B
IT
MCU
K
EYBOARD
C
ONTROLLER
2
GENERAL DESCRIPTION
(Continued)
Port 3
Counter/
Timers (2)
Interrupt
Control
Port 2
I/O
(Bit Programmable)
ALU
Flags
Register
Pointer
Register File
124 x 8-Bit
Machine Timing
& Instruction Control
Program
Memory
Program
Counter
Vcc
GND
Output
Input
Port 0
Port 1
I/O
Output Open-Drain
(Nibble Programmable)
I/O
Output Open-Drain
(Byte Programmable)
4
4
8
WDT
POR
/WDT
OUT
/RESET
XT
AL2
XT
AL1
Figure 1. Z08617 Functional Block Diagram