ST72321R9-Auto STMicroelectronics, ST72321R9-Auto Datasheet - Page 26

• Manufacturer Part Number: ST72321R9-Auto
• Description: 8-bit MCU for automotive with 60 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

Register and memory map
3
Figure 4.
Table 4.
26/243
Address
000Ah
000Bh
0000h
0001h
0002h
0003h
0004h
0005h
0006h
0007h
0008h
0009h
FFFFh
FFDFh
FFE0h
0FFFh
0000h
007Fh
0080h
0880h
087Fh
1000h
Interrupt & Reset Vectors
(2048 or 1024 Bytes)
Register and memory map
As shown in
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.
The highest address bytes contain the user reset and interrupt vectors.
IMPORTANT: Memory locations marked as “Reserved” must never be accessed. Accessing
a reserved area can have unpredictable effects on the device.
Related documentation
Executing Code in ST7 RAM (AN 985)
Memory map
Hardware register map
Port C
Port D
Block
Port A
Port B
Program Memory
HW Registers
(60K or 32K)
(see
(see
Reserved
RAM
Table
Table
Register label
PADR
PADDR
PAOR
PBDR
PBDDR
PBOR
PCDR
PCDDR
PCOR
PDDR
PDDDR
PDOR
Figure
4)
20)
4, the MCU is capable of addressing 64 Kbytes of memories and I/O
Port A Data Register
Port A Data Direction Register
Port A Option Register
Port B Data Register
Port B Data Direction Register
Port B Option Register
Port C Data Register
Port C Data Direction Register
Port C Option Register
Port D Data Register
Port D Data Direction Register
Port D Option Register
or 047Fh
or 067Fh
or 087Fh
00FFh
01FFh
Doc ID 13829 Rev 1
0080h
0100h
0200h
Register name
16-bit Addressing
Short Addressing
RAM (zero page)
256 Bytes Stack
RAM
1000h
8000h
FFFFh
Reset status
60 KBytes
32 KBytes
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
ST72321xx-Auto
(1)
(1)
(1)
(1)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Remarks