Clocks and Power Control
MPC561/MPC563 Reference Manual, Rev. 1.2
8-8
Freescale Semiconductor
Figure 8-4. MPC561/MPC563 Clocks
Note that GCLK1_50, GCLK2_50, and CLKOUT can have a lower frequency than GCLK1 and GCLK2.
This is to enable the external bus operation at lower frequencies (controlled by EBDF in the SCCR).
GCLK2_50 always rises simultaneously with GCLK2. When DFNH = 0, GCLK2_50 has a 50% duty
cycle. With other values of DFNH or DFNL, the duty cycle is less than 50%. Refer to
.
GCLK1_50 rises simultaneously with GCLK1. When the MPC561/MPC563 is not in gear mode, the
falling edge of GCLK1_50 occurs in the middle of the high phase of GCLK2_50. EBDF determines the
division factor between GCLK1/GCLK2 and GCLK1_50/GCLK2_50.
During power-on reset, the MODCK1, MODCK2, and MODCK3 pins determine the clock source for the
PLL and the clock drivers. These pins are latched on the positive edge of PORESET. Their values must be
stable as long as this line is asserted. The configuration modes are shown in
. MODCK1 specifies
GCLK1
GCLK2
GCLK1_50
GCLK2_50
CLKOUT
T1
T2
T3
T4
GCLK1_50
GCLK2_50
(EBDF = 00)
(EBDF = 00)
(EBDF = 01)
(EBDF = 01)
CLKOUT
(EBDF = 00)
(EBDF = 01)
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...