z89136 ZiLOG Semiconductor, z89136 Datasheet - Page 28

• Manufacturer Part Number: z89136
• Description: Low-cost Dtad Controller
• Manufacturer: ZiLOG Semiconductor

Z89135/136 (ROMless)
Low-Cost DTAD Controller
FUNCTIONAL DESCRIPTION
The Z8 CCP™ core incorporates special functions to en-
hance the Z8’s application in industrial, scientific research
and advanced technologies applications.
Reset. The device is reset in one of the following condi-
tions:
Program Memory. The Z8 addresses up to 24 KB of inter-
nal program memory and 40 KB external memory (Figure
16). The first 12 bytes of program memory are reserved for
the interrupt vectors. These locations contain six 16-bit
vectors that correspond to the five user interrupts and one
DSP interrupt. Byte 12 to byte 24575 consists of on-chip
mask-programmed ROM. At addresses 24576 and great-
er, the Z8 executes external program memory. In ROM-
less mode, the Z8 will execute external program memory
beginning at byte 12 and continuing through byte 65535.
1-28
Power-On Reset
Watch-Dog Timer
Stop-Mode Recovery Source
External Reset
P R E L I M I N A R Y
(Lower Byte)
(Upper Byte)
After RESET
First Byte of
Location of
Instruction
Executed
Interrupt
Interrupt
Vector
Vector
Figure 16. Program Memory Map
65535
24575
12
11
10
9
8
7
6
5
4
3
2
1
0
ROM and RAM
In ROM Mode
On-Chip
External
ROM
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
DS97TAD0300
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