56F8355 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

56F8355

16-Bit Digital Signal Controllers

Freescale Semiconductor 

Signal Pins

Table 2-2 Signal and Package Information for the 128-Pin LQFP (Continued)

Signal Name Pin No. Type

State

During

Reset

Signal Description

CLKO

6

Output

In reset, Clock Output — This pin outputs a buffered clock signal. Using

output is the SIM CLKO Select Register (SIM_CLKOSR), this pin can be

disabled programmed as any of the following: disabled, CLK_MSTR

(system clock), IPBus clock, oscillator output, prescaler clock and

postscaler clock. Other signals are also available for test

purposes.

See Part 6.5.7 for details.

A8

15

Output

In reset, Address Bus — A8 - A13 specify six of the address lines for

output is external program or data memory accesses. Depending upon the

disabled, state of the DRV bit in the EMI bus control register (BCR), A8 -

pullup is A13 and EMI control signals are tri-stated when the external bus is

enabled inactive.

(GPIOA0)

A9

(GPIOA1)

A10

(GPIOA2)

A11

(GPIOA3)

A12

(GPIOA4)

A13

(GPIOA5)

GPIOB0

Schmitt

Input/

16

Output

17

18

19

20

Port A GPIO — These six GPIO pins can be individually

programmed as input or output pins.

After reset, these pins default to address bus functionality and

must be programmed as GPIO.

To deactivate the internal pullup resistor, clear the appropriate

GPIO bit in the GPIOA_PUR register.

Example: GPIOA0, clear bit 0 in the GPIOA_PUR register.

Note: Primary function is not available in this package

configuration; GPIO function must be used instead.

27

Schmitt

Input,

Port B GPIO — These four GPIO pins can be programmed as

Input/

pullup

input or output pins.

Output

enabled

(A16)

GPIOB1

(A17)

GPIOB2

(A18)

GPIOB3

(A19)

Output

28

29

30

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 pullup resistor, clear bit 0 in the

GPIOB_PUR register.

Example: GPIOB1, clear bit 1 in the GPIOB_PUR register.

56F8355 Technical Data, Rev. 17

Freescale Semiconductor

21

Preliminary

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