Datasheet

Signal Pins
56F8365 Technical Data, Rev. 9
Freescale Semiconductor 21
GPIOB0
(A16)
27 Schmitt
Input/
Output
Output
Input,
pull-up
enabled
Port B GPIO — These four GPIO pins can be individually
programmed as an input or output pin.
Address Bus — A16 - A19 specify four of the address lines for
external program or data memory accesses. Depending upon the
state of the DRV bit in the EMI bus control register (BCR), A16 -
A19 and EMI control signals are tri-stated when the external bus
is inactive.
After reset, the default state is GPIO.
To deactivate the internal pull-up resistor, clear bit 0 in the
GPIOB_PUR register.
Example: GPIOB1, clear bit 1 in the GPIOB_PUR register.
GPIOB1
(A17)
28
GPIOB2
(A18)
29
GPIOB3
(A19)
30
GPIOB4
(A20)
(prescaler_
clock)
31 Schmitt
Input/
Output
Output
Output
Input,
pull-up
enabled
Port B GPIO — This GPIO pin can be individually programmed
as an input or output pin.
Address Bus — A20 specifies one of the address lines for
external program or data memory accesses. Depending upon the
state of the DRV bit in the EMI bus control register (BCR), A20
and EMI control signals are tri-stated when the external bus is
inactive.
Clock Output — can be used to monitor the prescaler_clock on
GPIOB4.
After reset, the default state is GPIO.
This pin can also be used to view the prescaler_clock. In these
cases, the GPIOB_PER can be used to disable the GPIO. The
CLKOSR register in the SIM can then be used to choose between
address and clock functions; see
Part 6.5.7 for details
To deactivate the internal pull-up resistor, clear bit 4 in the
GPIOB_PUR register.
Table 2-2 Signal and Package Information for the 128-Pin LQFP (Continued)
Signal
Name
Pin No. Type
State
During
Reset
Signal Description