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| 型号： | MCP23S09T-E/MG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PQCC16 |
| 封装： | 3 X 3 MM, 0.90 MM HEIGHT, PLASTIC, QFN-16 |
| 文件页数： | 21/50页 |
| 文件大小： | 607K |
| 代理商： | MCP23S09T-E/MG |
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MCP23009/MCP23S09
DS22121B-page 28
2009 Microchip Technology Inc.
1.7.5
INTERRUPT CONDITIONS
There are two possible configurations to cause
interrupts (configured via INTCON):
1.
Pins configured for interrupt-on-pin-change
will cause an interrupt to occur if a pin changes
to the opposite state. The default state is reset
after an interrupt occurs. For example, an
interrupt occurs by an input changing from 1 to
0
. The new initial state for the pin is a logic 0.
2.
Pins configured for interrupt-on-change from
register value will cause an interrupt to occur if
the corresponding input pin differs from the
register bit. The interrupt condition will remain as
long as the condition exists, regardless if the
INTAP or GPIO is read.
See Figure 1-11 and Figure 1-12 for more information
on interrupt operations.
FIGURE 1-11:
INTERRUPT-ON-PIN-
CHANGE
FIGURE 1-12:
INTERRUPT-ON-CHANGE
FROM REGISTER
DEFAULT
GPx
INT
ACTIVE
Port value
is captured
into INTCAP
Read GPIO
or INTCAP
Port value
is captured
into INTCAP
INT
Port value
is captured
into INTCAP
Read GPIO
or INTCAP
DEFVAL
X
1
X
GP2
7
6
5
4
3
210
GP:
ACTIVE
(INT clears only if interrupt
condition does not exist.)
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| MCP23009T-E/MG | 8 I/O, PIA-GENERAL PURPOSE, PQCC16 |
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| MCP23016-I/SS | 16 I/O, PIA-GENERAL PURPOSE, PDSO28 |
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