ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 22

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Central processing unit (CPU)
5
5.1
5.2
5.3
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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 9.
Reset value = stack higher address
Reset value = reset vector @ FFFEh-FFFFh
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
PCH
Reset value = 1
CPU registers
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
Figure 9
PCL
are not present in the memory mapping and are
0
0
0
0
0
0
C
X
Accumulator
X index register
Y index register
Program counter
Condition code register
Stack pointer
X = undefined value
ST72324B