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EPDDx — Edge Port Data Direction x
0 = Pin INTx is an input.
1 = Pin INTx is an output.
These bits are cleared by reset.
C.7.3 Edge Port Data Register (EPDR)
The edge port data register (EPDR) is a 16-bit register. Writes to EPDR are stored in
an internal latch, and if any pin of the port is configured as an output, the data stored
for that bit is driven onto the pin. Reads of this register return the value sensed on the
pins for those pins configured as inputs, or the data stored in the register for the pins
configured as outputs.
EPDR — Edge Port Data Register
15
14
13
12
R
0
0
0
0
W
RESET:
X = Unaffected by reset
EPD[7:0] — Edge Port Data Bits 7:0
See the above description. These bits are not affected by hardware reset.
C.7.4 Edge Port Flag Register (EPFR)
The 16-bit read/write edge port flag register (EPFR) indicates whether the selected
edge has been detected on the port pins.
EPFR — Edge Port Flag Register
15
14
13
12
R
0
0
0
0
W
RESET:
EPFx — Edge Port Flag Bit x
0 = Selected edge for INTx pin has not been detected.
1 = Selected edge for INTx pin has been detected.
Bits in this register are set when the programmed edge is detected on the corre-
sponding pin. A bit remains set until cleared by writing it to a one. Pin transitions do
not affect this register if the pin is configured as level sensitive (EPPARn=00), and the
corresponding flag bit(s) are cleared to zero in this case. When a pin is configured as
a general-purpose output, writes to EPDR which cause the selected level or edge
MMC2001
REFERENCE MANUAL
Freescale Semiconductor, Inc.
11
10
9
8
0
0
0
0
Figure C-30 Edge Port Data Register
11
10
9
8
0
0
0
0
Figure C-31 Edge Port Flag Register
PROGRAMMING REFERENCE
For More Information On This Product,
Go to: www.freescale.com
7
6
5
4
EPD7 EPD6 EPD5 EPD4 EPD3 EPD2 EPD1 EPD0
X
X
X
X
7
6
5
4
EPF7
EPF6
EPF5
EPF4
0
0
0
0
10007004
3
2
1
0
X
X
X
X
10007006
3
2
1
0
EPF3
EPF2
EPF1
EPF0
0
0
0
0
MOTOROLA
C-29
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