Z86L78 Datasheet, PDF (20/59 Pages) Zilog, Inc. – IR/Low-Voltage Microcontroller

Z86L78
IR/Low-Voltage Microcontroller
FUNCTIONAL DESCRIPTION
The Z86L78 incorporates special features to enhance the
standard Z8 core architecture to provide the user with in-
creased design flexibility in the areas of consumer and bat-
tery operated applications.
Reset. The device is reset in one of the following condi-
tions:
1. Power-On Reset
2. Watch-Dog Timer
Zilog
3. Stop-Mode Recovery Source
4. Low Voltage Detection
Program Memory. The Z86L78 addresses up to 16 KB of
internal program memory (Figure 14). The first 12 bytes of
program memory are reserved for the interrupt vectors.
These locations contain five 16-bit vectors that correspond
to the five available interrupts. Addresses to 16K consist of
on-chip mask-programmed ROM.
65535
65280
16384
Location of
First Byte of
Instruction
Executed
After RESET
12
11
10
9
8
7
Interrupt
Vector
(Lower Byte) ⁶
5
4
Interrupt
Vector
(Upper Byte) ³
2
1
0
256 bytes internal data RAM
Not Addressable
On-Chip
ROM
Reset Start Address
Reserved
Reserved
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
Figure 14. Program Memory Map
2-20
DS97LVO0701