4 index0 (index)—bit 7, 5 home0 (home)—bit 6, 6 clockout disable (clkdis)—bit 5 – Freescale Semiconductor 56F8122 User Manual
Page 85: 7 clockout select (clkosel)—bits 4–0, 8 sim gpio peripheral select register (sim_gps)
Register Descriptions
56F8322 Technical Data, Rev. 10.0
Freescale Semiconductor
85
Preliminary
6.5.7.4
INDEX0 (INDEX)—Bit 7
•
0 = Peripheral output function of GPIOB[5] is defined to be INDEX0
•
1 = Peripheral output function of GPIOB[5] is defined to be SYS_CLK
6.5.7.5
HOME0 (HOME)—Bit 6
•
0 = Peripheral output function of GPIOB[4] is defined to be HOME0
•
1 = Peripheral output function of GPIOB[4] is defined to be the prescaler clock (FREF, see
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 ROCS - 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 = MSTR_OSC 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
6.5.8
SIM GPIO Peripheral Select Register (SIM_GPS)
All of the peripheral pins on the 56F8322 and 56F8122 share their I/O with GPIO ports. To select
peripheral or GPIO control, program the GPIOx_PER register. When SPI 0 and SCI 1, Quad Timer C and
SCI 0, or PWMA and SPI 1 are multiplexed, there are two possible peripherals as well as the GPIO
functionality available for control of the I/O. The SIM_GPS register is used to determine which peripheral
has control. The default peripherals are SPI 0, Quad Timer C, and PWMA.