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參數資料
| 型號： | HT47C20L |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數學處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數： | 13/55頁 |
| 文件大?。?/td> | 341K |
| 代理商： | HT47C20L |
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HT47C20L
13
January 18, 2000
Labels
Bits
Function
C
0
Cissetiftheoperationresultsinacarryduringanadditionoperationorifabor-
row does not take place during a subtraction operation; otherwise C is cleared. C
is also affected by a rotate through carry instruction.
AC
1
ACissetiftheoperationresultsinacarryoutofthelownibblesinadditionorno
borrow from the high nibble into the low nibble in subtraction; otherwise AC is
cleared.
Z
2
Z is set if the result of an arithmetic or logic operation is zero; otherwise Z is
cleared.
OV
3
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.
PD
4
PD is cleared when either a system power-up or executing the CLR WDT in-
struction. 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 in-
struction. TO is set by a WDT time-out.
6
Undefined, read as 0
7
Undefined, 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 op-
eration 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), over-
flow flag (OV), power down flag (PD) and watch-
dog time-out flag (TO). It also records the status
informationandcontrolstheoperationsequence.
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 addition 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 in-
struction.
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 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 HT47C20L provides an external interrupt,
an internal timer/event counter interrupt, an
internal time base interrupt, and an internal
real time clock interrupt. The interrupt control
register 0 (INTC0;0BH) and interrupt control
register 1 (INTC1;1EH) both contain the inter-
rupt control bits to set the enable/disable and
interrupt request flags.
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相關代理商/技術參數 |
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| HT47C20L_05 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type Low Voltage 8-Bit Mask MCU |
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| HT47R20A-1 | 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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