Z86L825 Datasheet, PDF (26/79 Pages) Zilog, Inc. – 20-Pin Low-Voltage IR Microcontrollers

Z86L825/826/827
20-Pin Low-Voltage IR Microcontrollers
19
Functional Description
The Z86L82X incorporates special functions to enhance the Z8's functionality in
consumer and battery-operated applications.
Program Memory
The Z86L82X family addresses 4/8/16 KB of internal program memory. The first
12 bytes are reserved for interrupt vectors. These locations contain the five 16-bit
vectors that correspond to the five available interrupts.
RAM
The Z86L82X device has 237 bytes of RAM that make up the register file.
16383
Location of
First byte of
Instruction
Executed 12
After RESET 11
10
9
8
7
Interrupt ₆
Vector
(Lower Byte) ⁵
4
Interrupt
Vector ³
(Upper Byte) ₂
1
0
Not Accessible
On-Chip ROM
Reset Start Address
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
Figure 10. Program Memory Map (32K ROM)
Expanded Register File
The register file has been expanded to allow for additional system control regis-
ters and for mapping of additional peripheral devices into the register address
area. The Z8 register address space R0 through R15 has been implemented as
PS008808-1203
PRELIMINARY