- 您现在的位置：买卖IC网 > PDF目录385871 > ST72T85A5Q6 (意法半导体) 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES PDF资料下载
参数资料
| 型号： | ST72T85A5Q6 |
| 厂商： | 意法半导体 |
| 英文描述： | 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES |
| 中文描述： | 8位微控制器48,000铁路发展策略光盘，3K内存，ADC，两个定时器，2个SPI，I2C和脊髓损伤接口 |
| 文件页数： | 14/117页 |
| 文件大小： | 748K |
| 代理商： | ST72T85A5Q6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页
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 tothe 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 a64 byte stack,only 6 bits will beavailable.
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 StackPointer 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 twolocations 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 wellas 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
(POP)
ACCUMULATOR
X INDEX REGISTER
PCH
PCL
(PUSH)
DECREASING
MEMORY
1
1
1
VR000074
0
7
ADDRESSES
ADDRESSES
STACK
CONDITION CODE
R
I
相关PDF资料 |
PDF描述 |
|---|---|
| ST730C08L3 | PHASE CONTROL THYRISTORS |
| ST730C08L3L | PHASE CONTROL THYRISTORS |
| ST730C12L0 | PHASE CONTROL THYRISTORS |
| ST730C12L0L | PHASE CONTROL THYRISTORS |
| ST730C12L1 | PHASE CONTROL THYRISTORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST730 | 制造商:IRF 制造商全称:International Rectifier 功能描述:PHASE CONTROL THYRISTORS Hockey Puk Version |
| ST7-30 | 制造商:SUPERWORLD 制造商全称:Superworld Electronics 功能描述:POWER TRANSFORMER |
| ST-7300 | 制造商:GC Electronics 功能描述: |
| ST730186-3 | 制造商:KEMET Corporation 功能描述: 制造商:KET 功能描述: |
| ST730268-1 | 制造商:KEMET Corporation 功能描述: 制造商:KET 功能描述: |
发布紧急采购，3分钟左右您将得到回复。