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參數資料
| 型號： | W742C814 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數： | 11/46頁 |
| 文件大小： | 704K |
| 代理商： | W742C814 |
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W742C814
Publication Release Date: February 12, 2003
- 11 -
Revision A2
Bit 3 is reserved
Bit 2, Bit 1, Bit 0 Data memory bank preselect bits:
000 = Data bank 0 (000H - 07FH)
001 = Data bank 1 (080H - 0FFH)
010 = Data bank 2 (100H - 17FH)
011 = Data bank 3 (180H - 1FFH)
100 = Data bank 4 (200H - 27FH)
101 = Data bank 5 (280H - 2FFH)
110 = Data bank 6 (300H - 37FH)
111 = Data bank 7 (380H - 3FFH)
6.5 Accumulator (ACC)
The accumulator (ACC) is a 4-bit register used to hold results from the ALU and transfer data between
the memory, I/O ports, and registers.
6.6 Arithmetic and Logic Unit (ALU)
This is a circuit which performs arithmetic and logic operations. The ALU provides the following
functions:
Logic operations: ANL, XRL, ORL
Branch decisions: JB0, JB1, JB2, JB3, JNZ, JZ, JC, JNC, DSKZ, DSKNZ, SKB0, SKB1, SKB2,
SKB3
Shift operations: SHRC, RRC, SHLC, RLC
Binary additions/subtractions: ADC, SBC, ADD, SUB, ADU, DEC, INC
After any of the above instructions are executed, the status of the carry flag (CF) and zero flag (ZF) is
stored in the internal registers. CF can be read out by executing MOV R, CF.
6.7 Oscillator
The W742C814 provides a crystal oscillation circuit to generate the system clock through external
connections. The 32768 Hz crystal be connected to XIN and XOUT, and a capacitor must be
connected to XIN and XOUT if an accurate frequency is needed.
XIN
XOUT
Crystal
32768 Hz
Figure 6-3 System Clock Oscillator Configuration
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