Z86E21 Datasheet, PDF (2/12 Pages) Zilog, Inc. – CMOS Z8 OTP MICROCONTROLLER

GENERAL DESCRIPTION (Continued)
Output Input
Vcc GND
XTAL /AS /DS R//W /RESET
Port 3
UART
Counter/
Timers
(2)
Interrupt
Control
ALU
FLAGS
Register
Pointer
Register File
256 x 8-Bit
Machine Timing and
Instruction Control
Prg. Memory
8192 x 8-Bit
Program
Counter
Port 2
Port 0
Port 1
I/O
(Bit Programmable)
4
4
Address or I/O
(Nibble Programmable)
8
Address/Data or I/O
(Byte Programmable)
Functional Block Diagram
2