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參數(shù)資料
| 型號(hào)： | HT47C20 |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 14/56頁 |
| 文件大?。?/td> | 352K |
| 代理商： | HT47C20 |
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HT47C20
14
January 18, 2000
Register
Bit No.
Label
Function
INTC0
(0BH)
0
EMI
Control the master (global) interrupt
(1= enabled; 0= disabled)
1
EEI
Control the external interrupt
(1= enabled; 0= disabled)
2
ETBI
Control the time base interrupt
(1= enabled; 0= disabled)
3
ERTI
Control the real time clock interrupt
(1= enabled; 0= disabled)
4
EIF
External interrupt request flag
(1= active; 0= inactive)
5
TBF
Time base request flag
(1= active; 0= inactive)
6
RTF
Real time clock request flag
(1= active; 0= inactive)
7
Unused bit, read as 0
INTC1
(1EH)
0
ETI
Control the timer/event counter interrupt
(1= enabled; 0=disabled)
1
Unused bit, read as 0
2
Unused bit, read as 0
3
Unused bit, read as 0
4
TF
Internal timer/event counter request flag
(1= active; 0= inactive)
5
Unused bit, read as 0
6
Unused bit, read as 0
7
Unused bit, read as 0
INTC register
Once an interrupt subroutine is serviced, all
other interrupts will be blocked (by clearing the
EMI bit). This scheme may prevent any further
interrupt nesting. Other interrupt requests
may happen during this interval, but only the
interrupt request flag is recorded. If a certain
interrupt needs servicing within the service
routine, the EMI bit and the corresponding bit
of INTC0 or INTC1 may be set allow interrupt
nesting.Ifthestackisfull,theinterruptrequest
will not be acknowledged, even if the related in-
terrupt is enabled, until the SP is decremented.
If immediate service is desired, the stack must
bepreventedfrombecomingfull.
All these kinds of interrupt have a wake-up ca-
pability. As an interrupt is serviced, a control
transferoccursbypushingtheprogramcounter
onto the stack and then by branching to subrou-
tines at specified location(s) in the program
memory. Only the program counter is pushed
onto the stack. If the contents of the register
and status register (STATUS) is altered by the
interrupt service program which corrupts the
desired control sequence, the contents must be
saved first.
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