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參數資料
| 型號： | P90CL301 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low voltage 16-bit microcontroller |
| 中文描述： | 低電壓16位微控制器 |
| 文件頁數： | 17/92頁 |
| 文件大?。?/td> | 526K |
| 代理商： | P90CL301 |
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1996 Dec 11
17
Philips Semiconductors
Preliminary specification
Low voltage 16-bit microcontroller
P90CL301BFH (C100)
Table 18
Description of LIR0 to LIR3 bits
6.7.2.2
Pending Interrupt Flag Register (PIFR)
An additional register PIFR contains copies of the PIR flags. The PIF flags are set at the same time as the PIR flags when
an interrupt is activated, but these flags are not reset automatically during the interrupt acknowledge cycle. They can only
be cleared by software and keep a trace of the interrupt event. The detection of an external interrupt is indicated by the
corresponding PIF-bit being set to a logic 1.
Table 19
Pending Interrupt Flag Register (address FFFF 810F)
BIT
SYMBOL
DESCRIPTION
7 and 3
PIRn
Pending interrupt request
. n = 0 to 7; INT7 corresponds to the interrupt NMIN;
PIRn = 1, pending interrupt request for pin INTn. PIRn = 0 (default value after a CPU
reset), no pending interrupt. When a valid interrupt request has been detected this bit
is set. It is automatically reset by the interrupt acknowledge cycle from the CPU. It
can be reset by software by writing a logic 0, however writing a logic 1 has no effect
on the flag. To reset only one flag, a logic 0 should be written to the bit address and a
logic 1 to the other interrupt requests. The use of BCLR instruction should be
avoided (PIR7 is cleared when the pin NMIN is set HIGH)
6 to 4
2 to 0
IPLm.2 to IPLm.0
Interrupt priority level of pins INT0 to INT6 (fixed to ‘111B’ for NMIN in LIR3);
m = 0 to 6.
7
6
5
4
3
2
1
0
PIF7
PIF6
PIF5
PIF4
PIF3
PIF2
PIF1
PIF0
6.7.3
N
OTE ON SIMULTANEOUS INTERRUPTS
If an internal interrupt is immediately followed by an
external interrupt (i.e. both interrupts occurring within 12
clock cycles) and both these interrupts have the same
interrupt level, then the CPU might hang up during the
acknowledge cycle of the internal interrupt.
In the interrupt controller a flag WIN is set for each interrupt
as soon as the interrupt is activated and will be reset when
an interrupt of higher priority occurs or during the
acknowledge cycle. The WIN flag is used to determine
which PIR flag should be reset.
A conflict occurs if within the interval starting at the CPU
sampling of the first internal interrupt and ending at the
acknowledge cycle, a second external interrupt resets the
WIN flag of the first interrupt (external interrupts have
higher priority than internal).
When the CPU acknowledges the first internal interrupt the
auto-vector acknowledge signal cannot be asserted as its
WIN flag was reset, and the CPU hangs up.
This situation can be solved by using the bus time-out
counter controlled by the System Control Register
(SYSCON) with the bits WD and WDSC set. In the case of
hang-up an internal bus error condition will be asserted
after 16 clocks and the CPU will execute the exception
SPURIOUS INTERRUPT at vector 60H. In the exception
service routine the interrupt flags PIR should be polled to
detect which interrupts caused the conflict, the
corresponding PIR flags should be cleared by software
and a call to the interrupt routines executed.
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