Peripheral Pin Multiplexing (PPM) Module
MPC561/MPC563 Reference Manual, Rev. 1.2
18-6
Freescale Semiconductor
SCALE_TCLK_REG. The transmit signals, PPM_TX, will stay high as long as PPM_TSYNC is high
(equal to “1” in
).
Figure 18-5. PPM Clocks and Serial Data Signals
Complete transmit and receive cycles are based on the PPM_TSYNC clock. A cycle begins on the rising
edge of PPM_TSYNC, which goes high for one PPM_TCLK cycle. The transmit signals, PPM_TX[0:1],
will stay high as long as PPM_TSYNC is high (equal to “1” in
). Data bits start to transmit on
the falling edge of PPM_TSYNC. In receive mode, valid data starts to shift into RX_SHIFTER on the
falling edge of PPM_TSYNC. PPM_TSYNC stays low until the contents of TX_DATA have been shifted
out and/or 16 bits have been shifted into RX_SHIFTER. One data bit is transferred every PPM_TCLK
cycle.
SYSCLK
PPM_TCLK1
PPM_TCLK2
PPM_TCLK2
PPM_TSYNC
PPM_TX
PPM_RX
“1”
CHANNEL0
CHANNEL1
CHANNEL2
CHANNEL0
CHANNEL1
CHANNEL2
PPM_TCLK1 — TCLK in TDM Mode
PPM_TCLK2 — TCLK in SPI Mode
PPM_CLK2 — TCLK in SPI Mode, with inverted SPI clock polarity enabled
f
TCLK
= (f
SYSCLK
/2*
N
) where
N
is the value in SCALE_TCLK_REG
(see
Section 18.4.12, “ Scale Transmit Clock Register (SCALE_TCLK_REG)
Shading of PPM_RX signifies value is unknown
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...