mc56f8335 Freescale Semiconductor, Inc, mc56f8335 Datasheet - Page 20

• Manufacturer Part Number: mc56f8335
• Description: 16-bit Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

20
(prescaler_
(GPIOF0)
(GPIOF1)
(GPIOF2)
(GPIOF3)
GPIOB4
Signal
clock)
Name
(A20)
D10
D7
D8
D9
Table 2-2 Signal and Package Information for the 128-Pin LQFP (Continued)
Pin No.
31
22
23
24
26
Schmitt
Output
Output
Output
Output
Output
Input/
Input/
Input/
Type
disabled,
pull-up is
output is
enabled
In reset,
enabled
56F8335 Technical Data, Rev. 5
During
pull-up
Reset
State
Input,
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
To deactivate the internal pull-up resistor, clear bit 4 in the
GPIOB_PUR register.
Data Bus — D7 - D10 specify part of the data for external
program or data memory accesses. Depending upon the state of
the DRV bit in the EMI bus control register (BCR), D7 - D10 are
tri-stated when the external bus is inactive
Port F GPIO — These four GPIO pins can be individually
programmed as input or output pins.
After reset, these pins default to data bus functionality and should
be programmed as GPIO.
To deactivate the internal pull-up resistor, clear the appropriate
GPIO bit in the GPIOF_PUR register.
Example: GPIOF0, clear bit 0 in the GPIOF_PUR register.
Note: Primary function is not available in this package
configuration; GPIO function must be used instead.
for details.
Signal Description
Freescale Semiconductor
Preliminary