Z86L02 datasheet(20/37 Pages) ZILOG

20 / 37 page

Z86C02/E02/L02

Cost Effective, 512-Byte ROM CMOS Z8® Microcontrollers

Zilog

P R E L I M I N A R Y

DS96DZ80301

FUNCTIONAL DESCRIPTION (Continued)

Program Memory. The Z8 addresses up to 512 bytes of

internal program memory (Figure 12). The first 12 bytes of

program memory are reserved for the interrupt vectors.

These locations contain six 16-bit vectors that correspond

to the six available interrupts. Bytes 0-511 are on-chip one-

time programmable ROM.

registers, 61 general-purpose registers, and 12 control

and status registers R0-R3, R4-R127 and R241-R255, re-

spectively (Figure 13). General-purpose registers occupy

the 04H to 7FH address space. I/O ports are mapped as

per the existing CMOS Z8. The instructions can access

registers directly or indirectly through an 8-bit address

field. This allows short 4-bit register addressing using the

ed into eight working register groups, each occupying 16

continuous locations. The Register Pointer (Figure 14) ad-

dresses the starting location of the active working-register

group.

Figure 12. Program Memory Map

On-Chip

ROM

Location of

First Byte of

Instruction

Executed

After RESET

Interrupt

Vector

(Lower Byte)

Interrupt

Vector

(Upper Byte)

IRQ5

IRQ4

IRQ3

IRQ2

IRQ1

IRQ0

IRQ5

1024

Figure 13. Register File

SPL

Stack Pointer (Bits 7-0)

Reserved

Program Control Flags

Interrupt Mask Register

Interrupt Request Register

Interrupt Priority Register

Ports 0-1 Mode

Port 3 Mode

Port 2 Mode

To Prescaler

Timer/Counter0

T1 Prescaler

Timer/Counter1

Timer Mode

Not Implemented

General Purpose

Registers

Port 3

Port 2

Reserved

Port 0

IMR

IRQ

IPR

P3M

P2M

PRE0

PRE1

TMR

P01M

Flags

Indentifiers

Location

255

254

253

252

251

250

249

248

247

246

245

244

243

242

241

240

128

127

Z86L02 датащи(PDF) 20 Page - Zilog, Inc.

Z86L02 датащи(HTML) 20 Page - Zilog, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

датащи скачать

ссылки URL