Z86C90 Datasheet, PDF (2/14 Pages) Zilog, Inc. – ROMLESS CMOS Z8 8-BIT MICROCONTROLLER

GENERAL DESCRIPTION (Continued)
Output Input
Vcc
GND
Port 3
Counter/
Timers (2)
Interrupt
Control
Two Analog
Comparators
ALU
FLAGS
Register
Pointer
Register File
256 x 8-Bit
XTAL /AS /DS R//W /RESET
Machine Timing
&
Instruction Control
RESET
WDT, POR
Program
Counter
Port 2
I/O
(Bit Programmable)
Port 0
Port 1
4
4
Address or I/O
(Nibble Programmable)
8
Address/Data or I/O
(Byte Programmable)
Functional Block Diagram
2