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參數資料
| 型號： | W741C20X |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 4-BIT MICROCONTROLLER |
| 中文描述： | 4位微控制器 |
| 文件頁數： | 6/84頁 |
| 文件大小： | 486K |
| 代理商： | W741C20X |
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Preliminary W741C20X
- 6 -
FUNCTIONAL DESCRIPTION
Program Counter (PC)
Organized as an 11-bit binary counter (PC0 to PC10), the program counter generates the addresses
of the 2048
×
16 on-chip ROM containing the program instruction words. When jump or subroutine
call instructions or interrupt, or initial reset conditions are to be executed, the address corresponding
to the instruction will be loaded into the program counter. The format used is shown below.
ITEM
ADDRESS
INTERRUPT
PRIORITY
Initial Reset
000H
-
INT 0 (Divider)
004H
1st
INT 1 (Timer 0)
008H
2nd
INT 2 (Port RC)
00CH
3rd
INT 3 (
INT
pin)
INT 4 (Serial Port Input)
014H
4th
018H
5th
INT 5 (Serial Port Output)
01CH
6th
INT 6 (Timer 1)
020H
7th
JMP Instruction
XXXH
-
Subroutine Call
XXXH
-
Stack Register (STACK)
The stack register is organized as 11 bits x 8 levels (first-in, last-out). When either a call subroutine or
an interrupt is executed, the program counter will be pushed onto the stack register automatically. At
the end of a call subroutine or an interrupt service subroutine, the RTN instruction must be executed
to pop the contents of the stack register into the program counter. When the stack register is pushed
over the eighth level, the contents of the first level will be lost. In other words, the stack register is
always eight levels deep.
Program Memory (ROM)
The read-only memory (ROM) is used to store program codes; the look-up table is arranged as 2048
×
4 bits. The first three quarters of ROM (000H to 5FFH) are used to store instruction codes only, but
the last quarter (600H to 7FFH) can store both instruction codes and the look-up table. Each look-up
table element is composed of 4 bits, so the look-up table can be addressed up to 2048 elements.
Instruction MOVC R is used to read the look-up table and transfer table data to the RAM. The
organization of the program memory is shown in Figure 1.
相關PDF資料 |
PDF描述 |
|---|---|
| W741C240 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741C250 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741C260 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741E20X | 4-BIT FLASH MICROCONTROLLER |
| W741E260 | 4-BIT FLASH MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W741C250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| W741C260 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W741E200 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| W741E201 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
| W741E202 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
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