參數(shù)資料
型號: S1C621A0F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 140/161頁
文件大?。?/td> 1037K
代理商: S1C621A0F0A0100
S1C621A0 TECHNICAL HARDWARE
EPSON
I-55
CHAPTER 3: PERIPHERAL CIRCUITS (Interrupt and Halt)
Input Interrupt
An input interrupt can be invoked by the IK1 group (K10–
K13) or the IK0 group (K00–K03). As each pin contains an
fOSC1/8 (4 kHz) clock noise reject circuit, the input must
be held at low level for at least 16/fOSC1 (0.5 ms) to
assure an input interrupt.
For the K10–K13 group, the interrupt factor flag can be
set with the noise reject circuit bypassed by using the
mask option. In this case, the input must be held at low
level for at least 5 machine clocks (equivalent to 0.16 ms
in the 32 kHz mode or 11 s in the 455 kHz mode) to get
an assured input interrupt.
Since the noise reject circuit continues operating with the
CPU in the halt state, the CPU can be restarted by an
input interrupt. Note that, if this is impossible, initial
resetting under watchdog timer control is required.
K13
K12
K11
K10
Noise reject
circuit
K03
K02
K01
K00
fOSC1/8 (4 kHz)
Noise reject
circuit
IK1
(Falling edge)
IK0
(Falling edge)
Interrupt factor flag
Mask option
Fig. 3.11.2
Input Interrupt Circuit
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