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ST72321BXXX-AUTO Datasheet(PDF) 40 Page - STMicroelectronics

Part # ST72321BXXX-AUTO
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 40 Page - STMicroelectronics

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Central processing unit (CPU)
ST72321Bxxx-Auto
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5
Central processing unit (CPU)
5.1
Introduction
This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8-
bit data manipulation.
5.2
Main features
●
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
5.3
CPU registers
The six CPU registers shown in Figure 7 are not present in the memory mapping and are
accessed by specific instructions.
Figure 7.
CPU registers
Accumulator
X index register
Y index register
Stack pointer
Condition code register
Program counter
70
1C
1I1 H I0 N Z
Reset value = reset vector @ FFFEh-FFFFh
70
70
70
0
7
15
8
PCH
PCL
15
8 7
0
Reset value = stack higher address
Reset value = 1
X
11 X 1 X X
Reset value = XXh
Reset value = XXh
Reset value = XXh
X = undefined value


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