MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-79
Figure 19-43. Non-Coherency Event When Different CFIFOs Use the Same Buffer
CFIFO5
CF5_ADC1_CM3
3
CF5_ADC1_CM2
2
CF5_ADC1_CM1
1
CF5_ADC1_CM0
0
TNXTPTR*
ADC1**
Empty
1
Empty
0
CFIFO0 and CFIFO5 both have
** ADC command buffer can hold 2 entries.
CFIFO0
CF0_ADC1_CM3
3
CF0_ADC1_CM2
2
CF0_ADC1_CM1
1
CF0_ADC1_CM0
0
TNXTPTR*
commands to be sent to ADC1, and both
are not triggered.
(a)
CFIFO5
CF5_ADC1_CM3
3
CF5_ADC1_CM2
2
Sent
1
Sent
0
TNXTPTR*
ADC1
CF5_ADC1_CM1
1
CF5_ADC1_CM0
0
CFIFO5 becomes triggered and transfers
CFIFO0
CF0_ADC1_CM3
3
CF0_ADC1_CM2
2
CF0_ADC1_CM1
1
CF0_ADC1_CM0
0
TNXTPTR*
two commands to ADC1.
(b)
CFIFO5
CF5_ADC1_CM3
3
CF5_ADC1_CM2
2
Sent
1
Sent
0
TNXTPTR*
ADC1
CF0_ADC1_CM0
1
CF5_ADC1_CM1
0
CFIFO0 becomes triggered and transfers
CFIFO0
CF0_ADC1_CM3
3
CF0_ADC1_CM2
2
CF0_ADC1_CM1
1
Sent
0
TNXTPTR*
a command to ADC1. The sequence sent
through CFIFO5 becomes non-coherent.
(c)
TNXTPTR – Transfer Next Data Pointer.
CF
x
_ADCa_CM
n
– Command
n
in CFIFO
x
bound for ADCa.
*
Summary of Contents for MPC5553
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