- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98145 > ST72E85A5G0 (STMICROELECTRONICS) 8-BIT, UVPROM, 4.332 MHz, MICROCONTROLLER, CQFP80 PDF資料下載
參數(shù)資料
| 型號： | ST72E85A5G0 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 4.332 MHz, MICROCONTROLLER, CQFP80 |
| 封裝： | WINDOWED, CERAMIC, QFP- 80 |
| 文件頁數(shù)： | 24/117頁 |
| 文件大?。?/td> | 748K |
| 代理商： | ST72E85A5G0 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當(dāng)前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁
14/117
ST7285C
CPU REGISTERS (Cont’d)
Stack Pointer (SP) The Stack Pointer is a 16-bit
register. Since the stack size can vary from device
to device, the appropriate number of most signifi-
cant bits are forced so as to map the stack as de-
fined in the Memory Map. The number of least sig-
nificant digits thus available to the user will depend
on the stack size, for example in the case of a 128
byte stack, 7 bits will be available whereas in the
case of a 64 byte stack, only 6 bits will be available.
The stack is used to save the CPU context during
subroutine calls or interrupts. The user may also
directly manipulate the stack by means of the
PUSH and POP instructions.
Following an MCU Reset, or after a Restore fol-
lowing a Reset Stack Pointer instruction (RSP),
the Stack Pointer is set to point to the highest loca-
tion in the stack. It is then decremented after data
has been pushed onto the stack and incremented
after data is popped from the stack. When the low-
er limit is exceeded, the Stack Pointer wraps
around to the stack upper limit. The previously
stored information is then overwritten and there-
fore lost. The upper and lower limits of the stack
area are shown in the Memory Map.
A subroutine call occupies two locations and an in-
terrupt five locations in the stack area.
Condition Code Register (CC) The Condition
Code register is a 5-bit register which indicates the
result of the instruction just executed as well as the
state of the processor. These bits can be individu-
ally tested by a program and specified action taken
as a result of their state. The following paragraphs
describe each bit of the CC register in turn.
Half carry bit (H) The H bit is set to 1 when a carry
occurs between bits 3 and 4 of the ALU during an
ADD or ADC instruction. The H bit is useful in BCD
arithmetic subroutines.
Interrupt mask (I) When the I bit is set to 1, all in-
terrupts except the TRAP software interrupt are
disabled. Clearing this bit enables interrupts to be
passed to the processor core. Interrupts requested
while I is set are latched and can be processed
when I is cleared (only one interrupt request per in-
terrupt enable flag can be latched).
Negative (N) When set to 1, this bit indicates that
the result of the last arithmetic, logical or data ma-
nipulation is negative (i.e. the most significant bit is
a logic 1).
Zero (Z) When set to 1, this bit indicates that the
result of the last arithmetic, logical or data manipu-
lation is zero.
Carry/Borrow (C) When set, C indicates that a
carry or borrow out of the ALU occured during the
last arithmetic operation. This bit is also affected
during execution of bit test, branch, shift, rotate
and store instructions.
Figure 3. Stacking Order
INCREASING
MEMORY
UNSTACK
ACCUMULATOR
X INDEX REGISTER
PCH
PCL
(PUSH)
DECREASING
MEMORY
11
1
VR000074
0
7
ADDRESSES
STACK
(POP)
CONDITION CODE
RETURN
INTERRUPT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72F321J9T7 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST72F321J7T3 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST72F321J7T1 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST72F321J9T5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST72F324BJ6B6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72F260G1B5 | 功能描述:8位微控制器 -MCU Flask 4K SPI 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(shí)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 |
| ST72F260G1M6 | 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C/SCI 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(shí)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 |
| ST72F260G1M6/TR | 功能描述:8位微控制器 -MCU 8B MCU FLASH OR ROM MEMORY 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(shí)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 |
| ST72F262G1B5 | 功能描述:8位微控制器 -MCU Flask 4K SPI 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(shí)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 |
| ST72F262G1B6 | 功能描述:8位微控制器 -MCU 8B MCU 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(shí)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。