56F8167 datasheet(120/184 Pages) FREESCALE

120 / 184 page

56F8367 Technical Data, Rev. 7.0

120

Freescale Semiconductor

Preliminary

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00100 = Reserved for factory test—PFLASH even clock

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00101 = Reserved for factory test—BFLASH clock

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00110 = Reserved for factory test—DFLASH clock

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00111 = Oscillator output

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01000 = Fout (from OCCS)

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01001 = Reserved for factory test—IPB clock

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01010 = Reserved for factory test—Feedback (from OCCS, this is path to PLL)

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01011 = Reserved for factory test—Prescaler clock (from OCCS)

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01100 = Reserved for factory test—Postscaler clock (from OCCS)

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01101 = Reserved for factory test—SYS_CLK2 (from OCCS)

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01110 = Reserved for factory test—SYS_CLK_DIV2

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01111 = Reserved for factory test—SYS_CLK_D

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10000 = ADCA clock

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10001 = ADCB clock

6.5.8

GPIO Peripheral Select Register (SIM_GPS)

Some GPIO pads can have more than one peripheral selected as the alternate function instead of GPIO.

For these pads, this register selects which of the alternate peripherals are actually selected for the GPIO

peripheral function. This applies to GPIOC, pins 0-3, and to GPIOD, pins 0 and 1.

The GPIOC Peripheral Select register can be used to multiplex out any one of the three alternate

peripherals for GPIOC. The default peripheral is Quad Decoder 1 and Quad Timer B (NOT available in

the 56F8167 device); these peripherals work together.

The four I/O pins associated with GPIOC can function as GPIO, Quad Decoder 1/Quad TimerB , or as

SPI 1 signals. GPIO is not the default and is enabled/disabled via the GPIOC_PER, as shown in

Figure 6-10 and Table 6-2. When GPIOC[3:0] are programmed to operate as peripheral I/O, then the

choice between decoder/timer and SPI inputs/outputs is made in the SIM_GPS register and in conjunction

with the Quad Timer Status and Control Registers (SCR). The default state is for the peripheral function

of GPIOC[3:0] to be programmed as decoder functions. This can be changed by altering the appropriate

controls in the indicated registers.

56F8167 Datasheet(PDF) 120 Page - Freescale Semiconductor, Inc

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