Integrated Microcontroller Reference Manual

Edge Port Module (EPORT)
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
16-4 Freescale Semiconductor
16.4.2 EPORT Data Direction Register (EPDDR)
The EPORT data direction register (EPDDR) controls the direction of each one of the pins individually.
16.4.3 Edge Port Interrupt Enable Register (EPIER)
The EPORT interrupt enable register (EPIER) enables interrupt requests for each pin individually.
: 0x002 (EPDDR) Access: Supervisor read/write
76543210
R
EPDD7 EPDD6 EPDD5 EPDD4 EPDD3 EPDD2 EPDD1
0
W
Reset00000000
Figure 16-3. EPORT Data Direction Register (EPDDR)
Table 16-4. EPDDR Field Descriptions
Field Description
7–2
EPDDn
Setting any bit in the EPDDR configures the corresponding pin as an output. Clearing any bit in EPDDR configures
the corresponding pin as an input. Pin direction is independent of the level/edge detection configuration. Reset clears
EPDD7–EPDD1.
To use an EPORT pin as an external interrupt request source, its corresponding bit in EPDDR must be clear.
Software can generate interrupt requests by programming the EPORT data register when the EPDDR selects output.
0 Corresponding EPORT pin configured as input
1 Corresponding EPORT pin configured as output
1-0 Reserved, must be cleared.
IPSBAR
Offset:
0x13_0003 (EPIER) Access: User read/write
76543210
R
EPIE7 EPIE6 EPIE5 EPIE4 EPIE3 EPIE2 EPIE1
0
W
Reset:00000000
Figure 16-4. EPORT Port Interrupt Enable Register (EPIER)
Table 16-5. EPIER Field Descriptions
Field Description
7–1
EPIEn
Edge port interrupt enable bits enable EPORT interrupt requests. If a bit in EPIER is set, EPORT generates an
interrupt request when:
• The corresponding bit in the EPORT flag register (EPFR) is set or later becomes set.
• The corresponding pin level is low and the pin is configured for level-sensitive operation.
Clearing a bit in EPIER negates any interrupt request from the corresponding EPORT pin. Reset clears
EPIE7–EPIE1.
0 Interrupt requests from corresponding EPORT pin disabled
1 Interrupt requests from corresponding EPORT pin enabled
0 Reserved, must be cleared.