QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
14-15
displays the bits in PRESCALER field which enable a range of QCLK frequencies
Table 14-9. QACR0 Bit Descriptions
Bits
Name
Description
0
EMUX
Externally Multiplexed Mode. The EMUX bit allows the software to select the externally
multiplexed mode, which affects the interpretation of the channel numbers and forces the
MA0, MA1 and MA2 signals to be outputs.
0 Internally multiplexed, 16 possible channels
1 Externally multiplexed, up to 41 possible channels
See
for more information.
1:2
—
Reserved
3
TRG
Trigger Assignment. The TRG bit allows the software to assign the ETRIG[2:1] signals to
queue 1 and queue 2.
0 ETRIG1 triggers queue 1, ETRIG2 triggers queue 2
1 ETRIG1 triggers queue 2, ETRIG2 triggers queue 1
Refer to
Section 14.6.2, “External Trigger Input Signals
.”
4:8
—
Reserved
9:15
PRESCALER Prescaler Value. The PRESCALER value determines the QCLK frequency (f
QCLK
). Refer
Appendix F, “Electrical Characteristics
,” for more information on the QADC64E operating
clock frequency (f
QCLK
) values. f
QCLK
can range from 2-to-128 system clock cycles
(f
SYSCLK
). To keep f
QCLK
within the specified range, the value of PR1 is the
f
SYSCLK
Section 14.4.5, “QADC64E Clock (QCLK) Generation
” for more
information on selecting a PRESCALER value.
Table 14-10. Prescaler f
SYSCLK
Divide-by Values
Prescaler
[6:0]
f
SYSCLK
Div
Prescaler
[6:0]
f
SYSCLK
Div
Prescaler
[6:0]
f
SYSCLK
Div
Prescaler
[6:0]
f
SYSCLK
Div
0000000
2
0100000
33
1000000
65
1100000
97
0000001
2
0100001
34
1000001
66
1100001
98
0000010
3
0100010
35
1000010
67
1100010
99
0000011
4
0100011
36
1000011
68
1100011
100
0000100
5
0100100
37
1000100
69
1100100
101
0000101
6
0100101
38
1000101
70
1100101
102
0000110
7
0100110
39
1000110
71
1100110
103
0000111
8
0100111
40
1000111
72
1100111
104
0001000
9
0101000
41
1001000
73
1101000
105
0001001
10
0101001
42
1001001
74
1101001
106
0001010
11
0101010
43
1001010
75
1101010
107
0001011
12
0101011
44
1001011
76
1101011
108
0001100
13
0101100
45
1001100
77
1101100
109
0001101
14
0101101
46
1001101
78
1101101
110
0001110
15
0101110
47
1001110
79
1101110
111
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...