參數(shù)資料
型號： ST7FLCD1G9M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封裝： ROHS COMPLIANT, SO-28
文件頁數(shù)： 10/96頁
文件大?。?/td> 846K
代理商： ST7FLCD1G9M1
Central Processing Unit (CPU)
ST7FLCD1
The Stack Pointer is a 16-bit register always pointing to the next free location in the stack. The
pointer value increments when data is taken from the stack, it decrements once data is transferred
into the stack (see Figure 6).
Since the stack is 256 bytes deep, the most significant byte is forced by hardware. Following an
MCU Reset, or after a Reset Stack Pointer instruction (RSP), the Stack Pointer contains its reset
value (the SP7 to SP0 bits are set) which is the stack highest address.
The least significant byte of the Stack Pointer (called S) can be directly accessed by a LD
instruction.
Note:
When the lower limit is exceeded, the Stack Pointer wraps around the stack upper limit, without
indicating a stack overflow. The previously stored information is then overwritten and therefore lost.
The stack also wraps in case of an underflow.
The stack is used to save the return address during a subroutine call and the CPU context during an
interrupt. You can directly manipulate the stack using PUSH and POP instructions. In case of
interrupt, the PCL is stored at the first location pointed to by the SP. Other registers are then stored
in the next locations as shown in Figure 6.
When interrupt is received, the SP value decrements and the context is pushed to the stack.
On return from interrupt, the SP value increments and the context is popped from the stack.
A subroutine call and interrupt occupy two and five locations in the stack area respectively.
Figure 6: Stack Manipulation Example
Table 4: Instruction Set (Sheet 1 of 2)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Load and Transfer
LD
CLR
Stack operation
PUSH
POP
RSP
Increment/Decrement
INC
DEC
Compare and Tests
CP
TNZ
BCP
Logical operations
AND
OR
XOR
CPL
NEG
SP
Subroutine
Call
Interrupt
Event
PUSH Y
POP Y
IRET
RET
or RSP
h
Stack Higher Address = 01FFh
Stack Lower Address = 0100h
PCL
PCH
CC
A
X
PCH
PCL
PCH
PCL
CC
A
X
PCH
PCL
PCH
PCL
Y
CC
A
X
PCH
PCL
PCH
PCL
PCH
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST7FLI15BF1U6 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST7FLI15BF1U6TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST7FLI19BF1M3TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST7FLI19BF1U6TR 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST7FLI19BY1M3TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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