參數(shù)資料
型號(hào)： HT46R23
廠商： Holtek Semiconductor Inc.
英文描述： 8-Bit OTP Microcontroller
中文描述： 8位微控制器檢察官辦公室
文件頁(yè)數(shù)： 9/42頁(yè)
文件大?。?/td> 1172K
代理商： HT46R23
HT46R23
Rev. 1.30
9
August 17, 2001
Indirect addressing register
Location 00H and 02H are indirect addressing registers
that are not physically implemented. Any read/write op-
eration of [00H] or [02H] will access data memory
pointed to by MP0[01H] or MP1[03H] respectively.
Reading location 00H or 02H itself indirectly will return
the result 00H. Writing indirectly result in no operation.
The memory pointer registers (MP0 and MP1 are 8-bit
registers).
Accumulator
The accumulator is closely related to ALU operations. It
is also mapped to location 05H of the data memory and
can carry out immediate data operations. The data
movement between two data memory locations must
pass through the accumulator.
Arithmetic and logic unit
ALU
This circuit performs 8-bit arithmetic and logic operations.
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
also changes 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 flag. In addition
operations related to the status register may give dif-
ferent 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 in-
struction. The PD flag can be affected only by exe-
cuting the
system power-up.
HALT
or
CLR WDT
instruction or a
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
pushed onto the stack automatically. If the contents of
the status are important and if the subroutine can cor-
rupt the status register, precautions must be taken to
save it properly.
Interrupt
The device provides an external interrupt, an internal
timer/eventcounterinterrupt,theA/Dconverterinterrupt
andtheI
2
CBUSinterrupts.Theinterruptcontrolregister
0 (INTC0;0BH) and interrupt control register 1
(INTC1;1EH) contains the interrupt control bits to set the
enable/disable and the interrupt request flags.
Once an interrupt subroutine is serviced, all the other in-
terrupts will be blocked (by clearing the EMI bit). This
schememaypreventanyfurtherinterruptnesting.Other
interrupt requests may happen during this interval but
only the interrupt request flag is recorded. If a certain in-
terrupt requires servicing within the service routine, the
EMI bit and the corresponding bit of INTC0 and INTC1
may be set to allow interrupt nesting. If the stack is full,
theinterruptrequestwillnotbeacknowledged,evenifthe
related interrupt is enabled, until the SP is decremented.
If immediate service is desired, the stack must be pre-
vented from becoming full.
All these kinds of interrupts have a wake-up capability.
As an interrupt is serviced, a control transfer occurs by
pushing the program counter onto the stack, followed by
Labels
Bits
Function
C
0
C is set if the 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
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.
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 by system power-up or executing the CLR WDT instruction. PD is set by exe-
cuting the HALT instruction.
TO
5
TO is cleared by system power-up or executing the CLR WDT or HALT instruction. TO is
set by a WDT time-out.
6, 7
Unused bit, read as 0
Status register
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