st72321j STMicroelectronics, st72321j Datasheet - Page 12

• Manufacturer Part Number: st72321j
• Description: 8-bit Mcu With Nested Interrupts, Flash, 10-bit Adc, 5 Timers, Spi, Sci, I2c Interface
• Manufacturer: STMicroelectronics

ST72321J
3 REGISTER & MEMORY MAP
As shown in
dressing 64K bytes of memories and I/O registers.
The available memory locations consist of 128
bytes of register locations, up to 2 Kbytes of RAM
and up to 60 Kbytes of user program memory. The
RAM space includes up to 256 bytes for the stack
from 0100h to 01FFh.
Figure 3. Memory Map
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FFFFh
FFDFh
FFE0h
0FFFh
0000h
007Fh
0080h
0880h
087Fh
1000h
Interrupt & Reset Vectors
Figure
Program Memory
HW Registers
(2048 or 1536
(see
(see
(60K,48K)
Reserved
Bytes)
RAM
Table
Table
3, the MCU is capable of ad-
2)
8)
or 087Fh
00FFh
01FFh
0080h
0100h
0200h
067Fh
16-bit Addressing
Short Addressing
RAM (zero page)
256 Bytes Stack
The highest address bytes contain the user reset
and interrupt vectors.
IMPORTANT: Memory locations marked as “Re-
served” must never be accessed. Accessing a re-
seved area can have unpredictable effects on the
device.
RAM
1000h
4000h
FFFFh
60 KBytes
48 KBytes