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參數資料
| 型號： | W741C260 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| 中文描述： | 4-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數： | 15/92頁 |
| 文件大小： | 488K |
| 代理商： | W741C260 |
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W741C260
Publication Release Date: March 1998
- 15 -
Revision A3
Interrupts
The W741C260 provides four internal interrupt sources (Divider 0, Divider 1, Timer 0, Timer 1) and
one external interrupt source (port RC). Vector addresses for each of the interrupts are located in the
range of program memory (ROM) addresses 004H to 020H. The flags IEF, PEF, and EVF are used to
control the interrupts. When EVF is set to "1" by hardware and the corresponding bits of IEF and PEF
have been set by software, an interrupt is generated. When an interrupt occurs, all of the interrupts
are inhibited until the EN INT or MOV IEF,#I instruction is invoked. The interrupts can also be
disabled by executing the DIS INT instruction. When an interrupt is generated in hold mode, the hold
mode will be released momentarily and interrupt subroutine will be executed. After the RTN
instruction is executed in an interrupt subroutine, the
μ
C will enter hold mode again. The operation
flow chart is shown in Figure 8. The control diagram is shown below.
S
R
Q
S
R
Q
IEF.0
IEF.1
Interrupt
Process
Circuit
Interrupt
Vector
Generator
004H
008H
014H
IEF.2
S
R
Q
Initial Reset
MOV IEF, #I
Enable
EN INT
EVF.1
EVF.0
EVF.2
Initial Reset
CLR EVF, #I instruction
DIS INT instruction
Disable
Divider 0
overflow signal
Timer 0
underflow signal
Port RC
signal change
S
R
Q
S
R
Q
Timer 1
underflow signal
IEF.4
EVF.4
IEF.7
EVF.7
00CH
020H
Divider 1
overflow signal
Figure 7. Interrupt Event Control Diagram
Interrupt Enable Flag (IEF)
The interrupt enable flag is organized as an 8-bit binary register (IEF.0 to IEF.7). These bits are used
to control the interrupt conditions. It is controlled by the MOV IEF, #I instruction. When one of these
interrupts is accepted, the corresponding to the bit of the event flag will be reset, but the other bits are
unaffected. In interrupt subroutine, these interrupts will be disabled till the instruction MOV IEF, #I
or
EN INT
is executed again. Therefore, to enable these interrupts, the instructions MOV IEF, #I or EN
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