參數(shù)資料
型號： HT48CA1
廠商： Holtek Semiconductor Inc.
英文描述： Remote Type 8-Bit MCU
中文描述： 遠程型8位微控制器
文件頁數(shù)： 8/39頁
文件大?。?/td> 308K
代理商： HT48CA1
HT48RA1/HT48CA1
Rev. 1.00
8
June 25, 2004
sequently executed, stack overflow occurs and the first
entry will be lost (only the most recent 8 return ad-
dresses are stored).
Data Memory
RAM
The data memory is designed with 249 8 bits. The data
memory is divided into two functional groups: special
function registers and general purpose data memory
(224 8). Most are read/write, but some are read only.
The special function registers include the indirect ad-
dressing registers (R0;00H, R1;02H), Timer/Event
Counter 0 (TMR0;0DH), Timer/Event Counter 0 control
register (TMR0C;0EH), Timer/Event Counter 1 higher
order byte register (TMR1H;0FH), Timer/Event Coun-
ter 1 lower order byte register (TMR1L;10H),
Timer/Event Counter 1 control register (TMR1C;11H),
program counter lower-order byte register (PCL;06H),
memory pointer registers (MP0;01H, MP1;03H), accu-
mulator (ACC;05H), table pointer (TBLP;07H, TBHP;
1FH), table higher-order byte register (TBLH;08H), sta-
tus register (STATUS;0AH), interrupt control register
(INTC;0BH), Watchdog Timer option setting register
(WDTS;09H), I/O registers (PA;12H, PB;14H, PC;16H,
PF;1CH), and I/O control registers (PAC;13H,
PBC;15H, PCC;17H, PFC;1DH). The remaining space
before the 20H is reserved for future expanded usage
and reading these locations will get 00H . The general
purpose data memory, addressed from 20H to FFH, is
used for data and control information under instruction
commands.
All of the data memory areas can handle arithmetic,
logic, increment, decrement and rotate operations di-
rectly. Except for some dedicated bits, each bit in the
data memory can be set and reset by SET [m].i and
CLR [m].i . They are also indirectly accessible through
memory pointer registers (MP0 or MP1).
Indirect Addressing Register
Location 00H and 02H are indirect addressing registers
that are not physically implemented. Any read/write op-
eration of [00H] ([02H]) will access data memory pointed
to by MP0 (MP1). Reading location 00H (02H) itself indi-
rectly will return the result 00H. Writing indirectly results
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 of the data memory and can
carry out immediate data operations. The data move-
ment between two data memory locations must pass
through the accumulator.
Arithmetic and Logic Unit
ALU
This circuit performs 8-bit arithmetic and logic opera-
tions. The ALU provides the following functions:
Arithmetic operations (ADD, ADC, SUB, SBC, DAA)
Logic operations (AND, OR, XOR, CPL)
Increment and decrement (INC, DEC)
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.
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RAM Mapping
相關PDF資料
PDF描述
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