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HT49C10
11
September 28, 1999
register 0 (MP0;01H) or the memory pointer reg-
ister 1 (MP1;03H).
Indirect addressing register
Location 00H and 02H are indirect addressing
registers that are not physically implemented.
Any read/write operation of [00H] and [02H] ac-
cesses the RAM pointed to by MP0 (01H) and
MP1 (03H) respectively. Reading location 00H
or 02H indirectly returns the result 00H, while,
writing it leads to no operation.
The function of data movement between two in-
direct addressing registers is not supported.
The memory pointer registers, MP0 and MP1,
are both 7-bit registers used to access the RAM
by combining corresponding indirect address-
ing registers. The bit 7 of MP0 and MP1 are un-
defined and reading will return the result 1 .
Any writing operation to MP0 and MP1 will
only transfer the lower 7-bit data.
Only MP0 can be applied to data memory, while
MP1 can be applied to data memory and LCD
display memory.
Accumulator
ACC
The accumulator (ACC) is related to ALU oper-
ations. It is also mapped to location 05H of the
RAM and is capable of carrying out immediate
data operations. The data movement between
two data memory locations has to pass through
the ACC.
Arithmetic and logic unit
ALU
This circuit performs 8-bit arithmetic and logic
operations and 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 etc.)
The ALU not only saves the results of a data op-
eration but also changes the status register.
Status register
STATUS
The status register (0AH) is 8-bit wide and con-
tains a carry flag (C), an auxiliary carry flag
(AC), a zero flag (Z), an overflow flag (OV), a
power down flag (PD), and a watchdog time-out
flag (TO). It also records the status information
and controls the operation sequence.
Except for the TO and PD flags, bits in the status
register can be altered by instructions, similar to
other registers. Data written into the status reg-
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RAM mapping
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| HT49C30L | HDSP-A101 RED DISPLAY, LED, |
| HT49R30 | DISPLAY 7 SEGMENT |
| HT49R30A-1 | DISPL 7 SEG YELLOW |
| HT49C30-1 | 8-Bit LCD Type MCU |
| HT49C50 | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT49C10(48SSOP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT49C10-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
| HT49C10-1_12 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
| HT49C30-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit LCD Type MCU |
| HT49C30-1_12 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type 8-Bit MCU |
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