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ST72321AR6 Datasheet

  • ST72321AR6

  • 8-BIT MCU WITH NESTED INTERRUPTS, FLASH,10-BIT ADC, FIVE TIM...

  • STMicroelectronics   STMicroelectronics

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ST72321
3 REGISTER & MEMORY MAP
As shown in
Figure 4,
the MCU is capable of ad-
dressing 64K bytes of memories and I/O registers.
The available memory locations consist of 128
bytes of register locations, up to 2Kbytes of RAM
and up to 60Kbytes of user program memory. The
RAM space includes up to 256 bytes for the stack
from 0100h to 01FFh.
Figure 4. Memory Map
0000h
007Fh
0080h
The highest address bytes contain the user reset
and interrupt vectors.
IMPORTANT:
Memory locations marked as 鈥淩e-
served鈥?must never be accessed. Accessing a re-
seved area can have unpredictable effects on the
device.
HW Registers
(see
Table 2)
0080h
Short Addressing
RAM (zero page)
00FFh
0100h
RAM
(2048, 1536 or 1024 Bytes)
087Fh
0880h
256 Bytes Stack
01FFh
0200h
or 047Fh
or 067Fh
or 087Fh
1000h
Reserved
0FFFh
1000h
16-bit Addressing
RAM
60 KBytes
48 KBytes
32 KBytes
4000h
8000h
Program Memory
(60K, 48K or 32K)
FFDFh
FFE0h
FFFFh
Interrupt & Reset Vectors
(see
Table 7)
FFFFh
13/185

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