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參數(shù)資料
| 型號(hào)： | HT47C10L |
| 英文描述： | 8-Bit R-F Type Low Voltage Mask MCU |
| 中文描述： | 8位低電壓RF型微控制器面具 |
| 文件頁數(shù)： | 9/38頁 |
| 文件大小： | 287K |
| 代理商： | HT47C10L |
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HT47C10L
Rev. 1.10
9
October 2, 2002
Labels
Bits
Function
C
0
C is set if an operation results in a carry during an addition operation or if a borrow does not
take place during a subtraction operation; otherwise C is cleared. C is also affected by a rotate
through carry instruction.
AC
1
ACissetifanoperationresultsinacarryoutofthelownibblesinadditionornoborrowfromthe
high nibble into the low nibble in subtraction; otherwise AC is cleared.
Z
2
Z is set if the result of an arithmetic or logical operation is zero; otherwise Z is cleared.
OV
3
OV is set if an 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.
PD
4
PD is cleared by either a system power-up or executing the CLR WDT instruction. PD is set by
executing the HALT instruction.
TO
5
TO is cleared by a system power-up or executing the CLR WDT or HALT instruction. TO is set
by a WDT time-out.
6
Unused bit, read as 0
7
Unused bit, read as 0
STATUS register
Arithmetic and logic unit
ALU
This circuit performs 8-bit arithmetic and logic operation.
The ALU provides the following functions:
Arithmetic operations (ADD, ADC, SUB, SBC, DAA)
Logic operations (AND, OR, XOR, CPL)
Rotation (RL, RR, RLC, RRC)
Increment and Decrement (INC, DEC)
Branch decision (SZ, SNZ, SIZ, SDZ ....)
The ALU not only saves the results of a data operation but
can change the status register.
Status register
STATUS
This 8-bit register (0AH) contains the zero flag (Z), carry
flag (C), auxiliary carry flag (AC), overflow flag (OV),
power down flag (PD) and watchdog time-out flag (TO).
It also records the status information and controls the
operation sequence.
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 flags. In addi-
tion it should be noted that operations related to the
status register may give different results from those
intended. The TO and PD flags can only be changed
by the watchdog timer overflow, system power-up,
clearing the watchdog timer and executing the HALT
instruction.
The Z, OV, AC and C flags generally reflect the status of
the latest operations.
In addition, on entering the interrupt sequence or exe-
cuting the subroutine call, the status register will not be
automatically pushed onto the stack. If the contents of
status are important and if the subroutine can corrupt
the status register, precautions must be taken to save it
properly.
Interrupts
The HT47C10L provides an internal timer/event counter
interrupt and an internal time base interrupt. The inter-
rupt control register (INTC;0BH) contains the interrupt
control bits to set the enable/disable and interrupt re-
quest flags.
Once an interrupt subroutine is serviced, all other inter-
rupts will be blocked (by clearing the EMI bit). This
scheme may prevent any further interrupt nesting. Other
interrupt requests may happen during this interval, but
only the interrupt request flag is recorded. If a certain in-
terrupt needs servicing within the service routine, the
programmer may set the EMI bit and the corresponding
bitofINTCallowinterruptnesting.Ifthestackisfull,thein-
terrupt request will not be acknowledged, even if the re-
lated interrupt is enabled, until the SP is decremented. If
immediate service is desired, the stack must be prevented
from becoming full.
As an interrupt is serviced, a control transfer occurs by
pushing the program counter onto the stack, followed by
abranchtoasubroutineatspecifiedlocationsinthepro-
gram memory. Only the program counter is pushed onto
the stack. If the contents of the register and status regis-
ter (STATUS) is altered by the interrupt service program
which corrupts the desired control sequence, the con-
tents must be saved first.
The internal timer/event counter interrupt is initialized by
setting the timer/event counter interrupt request flag
(TF; bit 4 of INTC), caused by a timer A or timer B over-
flow. When the interrupt is enabled, and the stack is not
full and the TF bit is set, a subroutine call to location 04H
will occur. The related interrupt request flag (TF) will be
reset and the EMI bit cleared to disable further inter-
rupts.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT47C10L(44QFP) | Microcontroller |
| HT506 | HIGH TEMPERATURE ANALOG MULTIPLEXERS 16-CHANNEL SINGLE / 8-CHANNEL DUAL |
| HT506DB | HIGH TEMPERATURE ANALOG MULTIPLEXERS 16-CHANNEL SINGLE / 8-CHANNEL DUAL |
| HT506DC | HIGH TEMPERATURE ANALOG MULTIPLEXERS 16-CHANNEL SINGLE / 8-CHANNEL DUAL |
| HT507 | HIGH TEMPERATURE ANALOG MULTIPLEXERS 16-CHANNEL SINGLE / 8-CHANNEL DUAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT47C10L(44QFP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| HT47C20 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit R-F Type Mask MCU |
| HT47C20_02 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit R-F Type Mask MCU |
| HT47C20-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
| HT47C20-1_08 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
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