Z86E30 Zilog., Z86E30 Datasheet - Page 32

• Manufacturer Part Number: Z86E30
• Description: Z8 4K OTP Microcontroller
• Manufacturer: Zilog.

Z86E30/E31/E40
Z8 4K OTP Microcontroller
FUNCTIONAL DESCRIPTION
The MCU incorporates the following special functions to
enhance the standard Z8 architecture to provide the user
with increased design flexibility.
RESET. The device is reset in one of three ways:
1. Power-On Reset
2. Watch-Dog Timer
3. STOP-Mode Recovery Source
Note: Having the Auto Power-on Reset circuitry built-in,
the MCU does not need to be connected to an external
power-on reset circuit. The reset time is 5 ms (typical). The
MCU does not re-initialize WDTMR, SMR, P2M, and P3M
registers to their reset values on a STOP-Mode Recovery
operation.
32
After RESET
(Lower Byte)
(Upper Byte)
First Byte of
Location of
Instruction
Executed
Interrupt
Interrupt
Vector
Vector
65535
4096
4095
12
11
10
9
8
7
6
5
4
3
2
1
0
On-Chip One Time PROM
Figure 22. Program Memory Map
ROM and RAM
EPROM
External
(ROMless Z86E40 Only)
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
P R E L I M I N A R Y
Note: The device V
specification before the TPOR expires.
Program Memory. The MCU can address up to 4 KB of
Internal Program Memory (Figure 22). The first 12 bytes of
program memory are reserved for the interrupt vectors.
These locations contain six 16-bit vectors that correspond
to the six available interrupts. For EPROM mode, byte 12
(000CH) to address 4095 (0FFFH) consists of program-
mable EPROM. After reset, the program counter points at
the address 000CH, which is the starting address of the
user program.
In ROMless mode, the Z86E40 can address up to 64 KB
of External Program Memory. The ROM/ROMless option
is only available on the 44-pin devices.
CC
ROM and RAM
must rise up to the operating V
ROMless
External
IRQ5
IRQ5
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
IRQ0
IRQ0
DS97Z8X0500
Zilog
CC