Signal Descriptions
MPC561/MPC563 Reference Manual, Rev. 1.2
2-10
Freescale Semiconductor
Clocks and PLL
XTAL
1
O
XTAL
XTAL. This output signal is one of the connections to an
external crystal for the internal oscillator circuitry.
EXTAL
1
I
EXTAL
EXTAL. This signal is one of the connections to an external
crystal for the internal oscillator circuitry. If EXTAL is unused,
it must be grounded.
XFC
1
I
XFC
External Filter Capacitance. This input signal is the
connection for an external capacitor filter for the PLL
circuitry.
CLKOUT
1
O
CLKOUT
Clock Out. This output signal is the clock system frequency.
The CLKOUT drive strength can be configured to full
strength, half strength, quarter strength, or disabled. The
drive strength is configured using the COM[0:1] bits and
CQDS bits in the SCCR register in the USIU.
EXTCLK
1
I
EXTCLK
EXTCLK. This is the external frequency source for the
MPC561/MPC563. If EXTCLK is unused, it must be
grounded.
ENGCLK / BUCLK
1
O
ENGCLK (2.6
V)
ENGCLK. This is the engineering clock output. Drive voltage
can be configured to 2.6 V, 5 V (with slew-rate control), or
disabled. The drive voltage is configured using the
EECLK[0:1] bits in the SCCR register in the SIU.
O
BUCLK. When the MPC561/MPC563 is in limp mode, it is
operating from a less precise on-chip ring oscillator to allow
the system to continue minimum functionality until the
system clock is fixed. This backup clock can be seen
externally if selected by the values of the EECLK[0:1] bits in
the SCCR register in the USIU.
VDDSYN
1
I
VDDSYN
VDDSYN. This is the power supply of the PLL circuitry.
VSSSYN
1
I
VSSSYN
VSSSYN. This is the ground reference of the PLL circuitry.
Configuration
PULL_SEL
3
1
I
PULL_SEL
Pull Select. PULL_SEL determines whether the pull devices
on the MIOS and TPU signals are pull-ups or pull-downs.
When pull-ups are selected, the pull-ups are to 5.0 V except
the following MIOS signals will be pulled to 2.6V:
VF[0:2]/MPIO32B[0:2], VFLS[0:1]/MPIO32B[3:4], and
MDO[7:4]/MPIO32B[7:10]. When this pin is low, pull-downs
are selected.
TouCAN
A_CNTX0
1
O
A_CNTX0
TouCAN_A Transmit Data. This signal is the serial data
output.
A_CNRX0
1
I
A_CNRX0
TouCAN_A Receive Data. This signal is the serial data
input.
B_CNTX0
1
O
B_CNTX0
TouCAN_B Transmit Data. This signal is the serial data
output.
Table 2-1. MPC561/MPC563 Signal Descriptions (continued)
Signal Name
No. of
Signals
Type
Function after
Reset
1
Description
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...