mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1202

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Functional description
The pin interrupt function is included in EGPIO to supersede an existing KBI module.
The main difference is that the pin interrupt function is still able to operate only if a port
pin is configured as a digital pin even when EGPIO does not control the pin. That means
the pin interrupt, if enabled, can operate with another on-chip module at the same time.
When a port pin is controlled by EGPIO, if the pin interrupt is enabled for this pin (the
port interrupt pin enable register's bit is 1), the pin is configured as an input. When a port
pin is controlled by the digital function of another on-chip module, the pin interrupt, if
enabled (the port interrupt pin enable register's bit is 1), still operates because the EGPIO
always receives the actual logic level on external pads when the pin is configured for
digital use. But special care must be taken when the pin interrupt operates at the same
time with other on-chip modules, and it is strongly recommended to disable the pin
interrupt function when another on-chip module controls the pin for output function.
When a port pin is configured for analog function, the input for the pin interrupt function
is zero and it is recommended to disable the pin interrupt function as well.
1202
PTEDGn
PTEDG0
PTPn
PTP0
1
0
0
1
s
s
PTIPEn
PTIPE0
PTMOD
Figure 46-81. Diagram of pin interrupt function
MCF51JF128 Reference Manual, Rev. 2, 03/2011
V
V
DD
DD
D
D
CK
CK
CLR
CLR
Q
Q
PIN INTERRUPT FFn
PIN INTERRUPT FF0
Preliminary
DMA DONE
Write 1 to PTIFn
RESET
DMA DONE
Write 1 to PTIF0
RESET
STOP
STOP
SYNCHRONIZER
SYNCHRONIZER
STOP BYPASS
STOP BYPASS
BUSCLK
BUSCLK
Freescale Semiconductor, Inc.
PTIFn
PTIF0
PTDMAEN
PTIE
PIN DMA
REQUEST
PIN
INTERRUPT
REQUEST