Z86L71 datasheet(19/61 Pages) ZILOG

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Z86L70/71/75/C71

Zilog

IR/Low-Voltage Microcontroller

DS97LVO0500

P R E L I M I N A R Y

1-19

FUNCTIONAL DESCRIPTION

The Z8 incorporates special functions to enhance the Z8's

functionality in consumer and battery operated applica-

tions.

Reset. The device is reset in one of the following condi-

tions:

Power-On Reset

Watch-Dog Timer

Stop-Mode Recovery Source

Low Voltage Detection

Program Memory. The Z86L7X addresses up to 2K, 4K,

8 KB of internal program memory, with the remainder be-

ing external memory (Figure 13). The first 12 bytes of pro-

gram memory are reserved for the interrupt vectors. These

locations contain five 16-bit vectors that correspond to the

five available interrupts. Addresses 12 to 2K, 4K, 8K (de-

pendent on version) consist of on-chip mask-programmed

ROM.

Figure 13. Program Memory Map

Location of

First Byte of

Instruction

Executed

After RESET

Interrupt

Vector

(Lower Byte)

Interrupt

Vector

(Upper Byte)

Reserved

IRQ4

IRQ3

IRQ2

IRQ1

IRQ0

Reserved

On-Chip

ROM

Reset Start Address

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