Z86E7216PSC View Datasheet(PDF) - Zilog
Part Name
Description
MFG CO.
'Z86E7216PSC' PDF : 74 Pages View PDF
Z86E72/E73
OTP IR Microcontrollers
FUNCTIONAL DESCRIPTION
The Z8® CCP incorporates special functions to enhance Note: The Extended Data RAM cannot be used as
1 the Z8's functionality in consumer and battery operated ap- STACK or instruction/code memory. Accessing the
plications.
Extended Data RAM has the following condition: P01M
register bits D4-D3 cannot be set to 11.
Reset. The device is reset in one of the following condi-
tions:
65535
1. Power-On Reset
External ROM
16384
2. Watch-Dog Timer
3. Stop-Mode Recovery Source
4. Low Voltage Detection
Location of
First Byte of
Instruction
Executed
After RESET
12
On-Chip
ROM
Reset Start Address
5. External Reset
11
Reserved
Program Memory. The Z86E72/73 addresses up to
16K/32 Kbytes of internal program memory, with the re-
mainder being external memory (Figure 26). The first 12
bytes of program memory are reserved for the interrupt
vectors. These locations contain five 16-bit vectors that
correspond to the five available interrupts. Addresses of
16K/32K consist of on-chip OTP. At addresses 16K or 32K
and greater, the E72/73 executes external program mem-
ory fetches (refer to external memory timing specifica-
tions).
RAM. The Z86E72 has a 768-byte RAM, 256 bytes make
up the Register file. The remaining 512 bytes make up the
Extended Data RAM. The Z86E73 has just the 256 bytes
of the Register file.
10
9
8
7
Interrupt
Vector
(Lower Byte) 6
5
4
Interrupt
Vector
(Upper Byte) 3
2
Reserved
IRQ4
IRQ4
IRQ3
IRQ3
IRQ2
IRQ2
IRQ1
IRQ1
Extended Data RAM. The Extended Data RAM of the
Z86E72 occupies the address range FE00H-FFFFH (512
bytes). This range of addresses FD00H-FFFFH cannot be
used to directly read from or write to external memory. Ac-
cessing the Extended Data RAM is accomplished by using
LDE, LDEI, LDC, or LDCI instructions. Port 1 and Port 0
are free to be set as I/O or ADDR/DATA modes; except
high-impedance when accessing Extended Data RAM. In
addition, if the External Memory uses the same address
range of the Extended Data RAM it can be used as the Ex-
ternal Stack only.
1
IRQ0
0
IRQ0
Figure 20. Program Memory Map
DS96LVO1100
PRELIMINARY
1-27
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