Z86C91
Z86C91 is Microcomputer manufactured by Zilog.
November 1987
Features
[J plete microputer, 24 I/O lines, and up to 64K bytes of addressable external space each for program and data rnernory. l!l I 256-byte register file, including 236 general-purpose registers, 3 I/O port registers, and 16 status and control registers.
Cl Vectored, priority interrupts for I/O, counter/tirners, and UART. l:J On-chip oscillator that accepts crystal or external clock drive.
GENERAL DESCRIPTION
The Z86C91 is a CMOS ROM less version of the Z8 single-chip microputer. It offers all the outstanding Features of the Z8 family architecture except an on-chip program ROM. Use of external mernory rather than a
~16c~n (c:MOS rni@Mll(p;ss !:~® Miiecm€C@rnmp Tmier
13 Full-duplex UART and two programmable 8-bit counter/timers, each with a 6-bit programmable prescaler.
[J Register Pointer so that short, fast instructions can access anyone of the sixteen working-register groups.
[J Single + 5V power supply-all I/O pins TIL patible.
[J 12 and 16 MHz III CMOS process o Standby modes-Halt and Stop preprogramrned ROM enables this Z8 microcornputer to be used in low volume applications or where code flexibility is required.
_ 1TI~::
CONTROL
PORTO (NIBBLE PROGRAMMABLE) I/O OR Ae-A15
PORT' (BYTE
PROGRAMMABLE) ADo-AD7
RESET
+5V
R/VI GND os XTAL'
AS XTAL2 PO, P~ po, P2, po, P2,
PO, P2, po, P2,
POs Z86C91 po, MCU po,
P',
P2s P2,
P2, P3, P3,
P3,
P3,
P3,
P3s
P3,...
