56F8365 datasheet(21/180 Pages) FREESCALE

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Signal Pins

56F8365 Technical Data, Rev. 8

Freescale Semiconductor

Preliminary

GPIOB0

(A16)

Schmitt

Input/

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)

GPIOB2

(A18)

GPIOB3

(A19)

GPIOB4

(A20)

(prescaler_

clock)

Schmitt

Input/

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

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