Datasheet

Register Descriptions
56F8037/56F8027 Data Sheet, Rev. 8
Freescale Semiconductor 101
Figure 6-8 CLKO Select Register (SIM_CLKOUT)
6.3.7.1 Reserved—Bits 15–10
This bit field is reserved. Each bit must be set to 0.
6.3.7.2 PWM3—Bit 9
• 0 = Peripheral output function of GPIOA[3] is defined to be PWM3
• 1 = Peripheral output function of GPIOA[3] is defined to be the Relaxation Oscillator Clock
6.3.7.3 PWM2—Bit 8
• 0 = Peripheral output function of GPIOA[2] is defined to be PWM2
• 1 = Peripheral output function of GPIOA[2] is defined to be the system clock
6.3.7.4 PWM1—Bit 7
• 0 = Peripheral output function of GPIOA[1] is defined to be PWM1
• 1 = Peripheral output function of GPIOA[1] is defined to be 2X system clock
6.3.7.5 PWM0—Bit 6
• 0 = Peripheral output function of GPIOA[0] is defined to be PWM0
• 1 = Peripheral output function of GPIOA[0] is defined to be 3X system clock
6.3.7.6 Clockout Disable (CLKDIS)—Bit 5
• 0 = CLKOUT output function is enabled and will output the signal indicated by CLKOSEL
• 1 = CLKOUT output function is disabled
6.3.7.7 Clockout Select (CLKOSEL)—Bits 4–0
CLKOSEL selects clock to be muxed out on the CLKO pin as defined in the following. Internal delay to
CLKO output is unspecified. Signal at the output pad is undefined when CLKO signal frequency exceeds
the rated frequency of the I/O cell. CLKO may not operate as expected when CLKDIS and CLKOSEL
settings are changed.
• 00000 = Continuous system clock
• 00001 = Continuous peripheral clock
• 00010 = 3X system clock
• 00100.....11111 = Reserved for factory test
Base + $A
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read
0 0 0 0 0 0
PWM
3PWM2PWM1PWM0
CLK
DIS
CLKOSEL
Write
RESET
0 0 0 0 0 0 0 0 0 0 100000