56F8156 Просмотр технического описания (PDF) - Freescale Semiconductor

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56F8156

16-bit Digital Signal Controllers

Freescale Semiconductor 

Table 2-2 Signal and Package Information for the 144-Pin LQFP (Continued)

Signal Name Pin No. Type

State

During

Reset

Signal Description

GPIOB0

33

Schmitt

Input,

Port B GPIO — This GPIO pin can be programmed as an input or

Input/

pull-up output pin.

Output

enabled

(A16)

Output

Address Bus — A16 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), A16 and

EMI control signals are tri-stated when the external bus is inactive.

Most designs will want to change the DRV state to DRV = 1 instead of

using the default setting.

After reset, the start-up state of GPIOB0 (GPIO or address) is

determined as a function of EXTBOOT, EMI_MODE and the Flash

security setting. See Table 4-4 for further information on when this

pin is configured as an address pin at reset. In all cases, this state

may be changed by writing to GPIOB_PER.

To deactivate the internal pull-up resistor, clear bit 0 in the

GPIOB_PUR register.

D0

59

Input/

In reset, Data Bus — D0 - D6 specify part of the data for external program or

Output

output is data memory accesses.

disabled,

pull-up is Depending upon the state of the DRV bit in the EMI bus control

enabled register (BCR), D0 - D6 are tri-stated when the external bus is

inactive.

Most designs will want to change the DRV state to DRV = 1 instead of

using the default setting.

(GPIOF9)

D1

(GPIOF10)

D2

(GPIOF11)

D3

(GPIOF12)

D4

(GPIOF13)

D5

(GPIOF14)

D6

(GPIOF15)

Input/

Output

60

72

75

76

77

78

Port F GPIO — These seven GPIO pins can be individually

programmed as input or output pins.

At reset, these pins default to the EMI Data Bus function.

To deactivate the internal pull-up resistor, clear the appropriate

GPIO bit in the GPIOF_PUR register.

Example: GPIOF9, clear bit 9 in the GPIOF_PUR register.

56F8356 Technical Data, Rev. 13

22

Freescale Semiconductor

Preliminary

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