Z86K14 datasheet(13/24 Pages) ZILOG

13 / 24 page

Z86K13/K14/K15/K16/K17/K18

Zilog

CMOS Z8® 8-Bit MCU Keyboard Controllers

DS97KEY0204

P R E L I M I N A R Y

Program Memory. The 16-bit program counter addresses

4 KB of program memory space at internal locations (Fig-

ure 11).

The first 12 bytes of program memory are reserved for the

interrupt vectors. These locations have six 16-bit vectors

that correspond to the five available interrupts.

Byte 12 to byte 4095* consists of on-chip, mask pro-

grammed ROM. Addresses 4096* and greater are re-

served. (*2048 for K13/K16, 3072 for K14/K17)

I/O port registers, 188 general-purpose registers (exclud-

ing P00-P03), and 11 control and status registers (R3-R0,

R191-R4, and R255-R240, respectively). The instructions

can access registers directly or indirectly through an 8-bit

address field. This allows short, 4-bit register addressing

using the Register Pointer. In the 4-bit mode, the register

file is divided into nine working-register groups, each occu-

pying 16 continuous locations. The Register Pointer ad-

dresses the starting location of the active working-register

group.

Figure 11. Program Memory Map

Figure 12. Register Pointer Register

On-Chip

ROM

Location of

First Byte of

Instruction

Executed

After RESET

Interrupt

Vector

(Lower Byte)

Interrupt

Vector

(Upper Byte)

Reserved

IRQ4

IRQ3

IRQ2

IRQ1

IRQ0

Reserved

65535

2048/3072/4096

2047/3071/4095

Reserved

D7 D6 D5 D4 D3 D2 D1 D0

R253 RP

Reserved

Working Register

Group

Default setting after RESET = 00000000

Figure 13. Register File Conﬁguration

Stack Pointer (Bits 7-0)

R25

Reserved

Program Control Flags

Interrupt Mask Register

Interrupt Request Register

Interrupt Priority Register

Reserved

Port 3 Mode

Port 2 Mode

T0 Prescaler

Timer/Counter0

Reserved

Timer Mode

Reserved

Not Implemented

General-Purpose

Registers

Port 3

Port 2

Port 1

Port 0

R25

R253

R252

R251

R250

R249

R248

R247

R246

R245

R244

R243

R242

R241

R240

R 191

SPL

FLAGS

IMR

IRQ

IPR

P3M

P2M

PREQ

TMR

LOCATION

IDENTIFIERS

Note:* Will not be reset with a STOP Mode Recovery.

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