Datasheet

56F8356 Technical Data, Rev. 13
118 Freescale Semiconductor
Preliminary
6.5.7.3 Alternate GPIOB Peripheral Function for A22 (A22)—Bit 8
• 0 = Peripheral output function of GPIOB6 is defined to be A22
• 1 = Peripheral output function of GPIOB6 is defined to be SYS_CLK2
6.5.7.4 Alternate GPIOB Peripheral Function for A21 (A21)—Bit 7
• 0 = Peripheral output function of GPIOB5 is defined to be A21
• 1 = Peripheral output function of GPIOB5 is defined to be SYS_CLK
6.5.7.5 Alternate GPIOB Peripheral Function for A20 (A20)—Bit 6
• 0 = Peripheral output function of GPIOB4 is defined to be A20
• 1 = Peripheral output function of GPIOB4 is defined to be the prescaler_clock (FREF, see Figure 3-4)
6.5.7.6 Clockout Disable (CLKDIS)—Bit 5
• 0 = CLKOUT output is enabled and will output the signal indicated by CLKOSEL
• 1 = CLKOUT is tri-stated
6.5.7.7 CLockout Select (CLKOSEL)—Bits 4–0
Selects clock to be muxed out on the CLKO pin.
• 00000 = SYS_CLK (from OCCS - DEFAULT)
• 00001 = Reserved for factory test—56800E clock
• 00010 = Reserved for factory test—XRAM clock
• 00011 = Reserved for factory test—PFLASH odd clock
• 00100 = Reserved for factory test—PFLASH even clock
• 00101 = Reserved for factory test—BFLASH clock
• 00110 = Reserved for factory test—DFLASH clock
• 00111 = Oscillator output
• 01000 = F
out
(from OCCS)
• 01001 = Reserved for factory test—IPB clock
• 01010 = Reserved for factory test—Feedback (from OCCS, this is path to PLL)
• 01011 = Reserved for factory test—Prescaler clock (from OCCS)
• 01100 = Reserved for factory test—Postscaler clock (from OCCS)
• 01101 = Reserved for factory test—SYS_CLK2 (from OCCS)
• 01110 = Reserved for factory test—SYS_CLK_DIV2
• 01111 = Reserved for factory test—SYS_CLK_D
• 10000 = ADCA clock
• 10001 = ADCB clock
6.5.8 GPIO Peripheral Select Register (SIM_GPS)
The GPIO 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 56F8156