Z86C34 Datasheet, PDF (2/70 Pages) Zilog, Inc. – CMOS Z8 MCUs WITH ASCI UART OFFER EFFICIENT, COST-EFFECTIVE DESIGN FLEXIBILITY

Z86C34/C35/C36/C44/C45/C46
CMOS Z8® MCUs with ASCI UART
GENERAL DESCRIPTION (Continued)
configurable under software control to provide timing, sta-
tus signals, parallel I/O with or without handshake, and ad-
dress/data bus for interfacing external memory.
To unburden the system from coping with real-time tasks
such as counting/timing and data communication, the Z8
offer two on-chip counter/timers with a large number of
user-selectable modes.
With ROM/ROMless selectivity, the Z86C44/C45/C46
provide both external memory and preprogrammed ROM,
which enables this Z8^® MCU to be used in high-volume ap-
plications, or where code flexibility is required.
ZiLOG
Note: All signals with an overline are active Low. For exam-
ple, B/W, for which WORD is active Low, and B/W, for
which BYTE is active Low.
Power connections follow these conventional descriptions:
Connection
Power
Ground
Circuit
V_CC
GND
Device
V_DD
V_SS
Output Input
Port 3
Counter/
Timers (2)
Interrupt
Control
Two Analog
Comparators
Full-Duplex
UART
16-Bit Baud
Rate Generator
V_CC
GND
ALU
FLAG
Register
Pointer
Register File
(C44/C45/C46 Only)
XTAL AS DS R/W RESET
Machine
Timing & Inst.
Control
RESET
WDT, POR
Program
Memory
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)
(C44/C45/C46 Only)
Figure 1. Functional Block Diagram
2
PRELIMINARY
DS007601-Z8X0499