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HT46R47(18SOP-A) 参数 Datasheet PDF下载

HT46R47(18SOP-A)图片预览
型号: HT46R47(18SOP-A)
PDF下载: 下载PDF文件 查看货源
内容描述: 模拟IC\n [Analog IC ]
分类和应用: 模拟IC
文件页数/大小: 45 页 / 293 K
品牌: ETC [ ETC ]
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HT46R47  
status information and controls the operation  
sequence.  
ternal timer/event counter interrupt and A/D  
converter interrupts. The Interrupt Control  
Register (INTC;0BH) contains the interrupt  
control bits to set the enable/disable and the in-  
terrupt request flags.  
With the exception of the TO and PD flags,  
bits in the status register can be altered by  
instructions like most other registers. Any  
data written into the status register will not  
change the TO or PD flag. In addition opera-  
tions related to the status register may give  
different results from those intended. The  
TO flag can be affected only by system  
power-up, a WDT time-out or executing the  
"CLR WDT" or "HALT" instruction. The PD  
flag can be affected only by executing the  
"HALT" or "CLR WDT" instruction or a sys-  
tem power-up.  
Once an interrupt subroutine is serviced, all  
the other interrupts will be blocked (by clearing  
the EMI bit). This scheme may prevent any fur-  
ther interrupt nesting. Other interrupt re-  
quests may happen during this interval but  
only the interrupt request flag is recorded. If a  
certain interrupt requires servicing within the  
service routine, the EMI bit and the correspond-  
ing bit of INTC may be set to allow interrupt  
nesting. If the stack is full, the interrupt request  
will not be acknowledged, even if the related in-  
terrupt is enabled, until the SP is decremented.  
If immediate service is desired, the stack must  
be prevented from becoming full.  
The Z, OV, AC and C flags generally reflect the  
status of the latest operations.  
In addition, on entering the interrupt sequence  
or executing the subroutine call, the status reg-  
ister will not be pushed onto the stack automat-  
ically. If the contents of the status are  
important and if the subroutine can corrupt the  
status register, precautions must be taken to  
save it properly.  
All these kinds of interrupts have a wake-up ca-  
pability. As an interrupt is serviced, a control  
transfer occurs by pushing the program counter  
onto the stack, followed by a branch to a sub-  
routine at specified location in the program  
memory. Only the program counter is pushed  
onto the stack. If the contents of the register or  
status register (STATUS) are altered by the in-  
terrupt service program which corrupts the de-  
Interrupt  
The device provides an external interrupt, in-  
Labels Bits  
Function  
C is set if the operation results in a carry during an addition operation or if a bor-  
row does not take place during a subtraction operation; otherwise C is cleared. C  
is also affected by a rotate through carry instruction.  
0
1
C
AC is set if the operation results in a carry out of the low nibbles in addition or no  
borrow from the high nibble into the low nibble in subtraction; otherwise AC is  
cleared.  
AC  
Z is set if the result of an arithmetic or logic operation is zero; otherwise Z is  
cleared.  
2
3
4
5
Z
OV is set if the operation results in a carry into the highest-order bit but not a  
carry out of the highest-order bit, or vice versa; otherwise OV is cleared.  
OV  
PD  
PD is cleared by system power-up or executing the "CLR WDT" instruction. PD  
is set by executing the "HALT" instruction.  
TO is cleared by system power-up or executing the "CLR WDT" or "HALT" in-  
struction. TO is set by a WDT time-out.  
TO  
¾
6, 7 Unused bit, read as "0"  
Status register  
10  
Rev. 1.40  
July 18, 2001