ST72321J7-Auto STMicroelectronics, ST72321J7-Auto Datasheet - Page 33

• Manufacturer Part Number: ST72321J7-Auto
• Description: 8-bit MCU for automotive with 48 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321J7-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

ST72321xx-Auto
5
5.1
5.2
5.3
Central processing unit (CPU)
Introduction
This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8-
bit data manipulation.
Main features
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CPU registers
The six CPU registers shown in
accessed by specific instructions.
Figure 7.
Reset value = reset vector @ FFFEh-FFFFh
Reset value = stack higher address
15
15
Enable executing 63 basic instructions
Fast 8-bit by 8-bit multiply
17 main addressing modes (with indirect addressing mode)
Two 8-bit index registers
16-bit stack pointer
Low power Halt and Wait modes
Priority maskable hardware interrupts
Non-maskable software/hardware interrupts
CPU registers
PCH
Reset value = 1
8
8 7
Reset value = XXh
Reset value = XXh
Reset value = XXh
7
7
7
1
7
7
1 I1 H I0 N Z
1 1 X 1 X X
Doc ID 13829 Rev 1
Figure 7
PCL
are not present in the memory mapping and are
0
0
0
0
0
X
0
C
Accumulator
X index register
Y index register
Program counter
Condition code register
Stack pointer
Central processing unit (CPU)
X = undefined value
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