Z87C33 Datasheet, PDF (18/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
12
interrupts. Address 12 to address 4095 consists of on-chip mask-programmed
ROM.
The 4 KB program memory is mask programmable. A ROM protect feature pre-
vents dumping of the ROM contents by inhibiting execution of LDC, LDCI, LDE,
and LDEI instructions to program memory in external program mode. ROM look-
up tables can be used with this feature. The ROM Protect option is mask-pro-
grammable, to be selected by the customer when the ROM code is submitted.
See Figure 7.
65537
4096
4095
Location of first Byte
of Instruction Executed
after RESET
12
11
10
9
8
Interrupt ⁷
Vector
(Lower Byte)
6
5
Interrupt ⁴
Vector
(Upper Byte)
3
2
1
0
Reserved
On-Chip
ROM
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
Figure 7.Program Memory Map
ROM Protect. ROM PROTECT provides an additional security function. When the
ROM PROTECT option bit is selected, and executing out of Internal Program
PS015601-1003