z08617 ZiLOG Semiconductor, z08617 Datasheet - Page 10

• Manufacturer Part Number: z08617
• Description: Nmos Z8 8-bit Mcu Keyboard Controller
• Manufacturer: ZiLOG Semiconductor

FUNCTIONAL DESCRIPTION
The device incorporates special functions to enhance
Zilog's Z8 applications as a keyboard controller, scien-
tific research and advanced technologies applications.
Program Memory.
dresses 4 Kbytes of program memory space at inter-
nal locations (Figure 9).
10
The 16-bit program counter ad-
After RESET
(Lower Byte)
(Upper Byte)
First Byte of
Location of
Instruction
Executed
Interrupt
Interrupt
Vector
Vector
65535
4096
4095
12
10
11
9
8
7
6
5
4
3
2
1
0
Figure 9. Program Memory Map
Reserved
On-Chip
ROM
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
The first 12 bytes of program memory are reserved for the
interrupt vectors. These locations have six 16-bit vectors
that correspond to the six available interrupts.
Byte 12 to byte 4095 consists of on-chip, mask
programmed ROM. Addresses 4096 and greater are
reserved.
Z08617 NMOS Z8
K
EYBOARD
®
C
8-B
ONTROLLER
IT
MCU