mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 684

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Memory Map/Register Definitions
30.7.3 CMP Filter Period Register (CMPx_FPR)
Addresses: CMP0_FPR is FFFF_8530h base + 2h offset = FFFF_8532h
30.7.4 CMP Status and Control Register (CMPx_SCR)
Addresses: CMP0_SCR is FFFF_8530h base + 3h offset = FFFF_8533h
684
FILT_PER
Field
Reset
Field
Reset
Read
7–0
Read
Write
Write
EN
0
Bit
Bit
0
1
Comparator Module Enable
The EN bit enables the Analog Comparator Module. When the module is not enabled, it remains in the off
state, and consumes no power. When you select the same input from analog mux to the positive and
negative port, the comparator is disabled automatically.
0
1
Filter Sample Period
When CR1[SE] is equal to zero, this field specifies the sampling period, in bus clock cycles, of the
comparator output filter. Setting FILT_PER to 0x0 disables the filter. Filter programming and latency
details appear in the Functional Description.
This field has no effect when CR1[SE] is equal to one. In that case, the external SAMPLE signal is used
to determine the sampling period.
7
0
7
0
0
The comparator output (CMPO) is not available on the associated CMPO output pin. Instead, the INV
bit is driven if the comparator owns the pin (usually a result of properly setting pin mux controls at the
SoC level). If the comparator does not own the pin, this bit has no effect.
The comparator output (CMPO) is available on the associated CMPO output pin. The comparator
output (CMPO) is driven out on the associated CMPO output pin if the comparator owns the pin. If the
comparator does not own the pin, this bit has no effect.
Analog Comparator disabled.
Analog Comparator enabled.
DMAEN
CMPx_CR1 field descriptions (continued)
0
0
6
6
MCF51JF128 Reference Manual, Rev. 2, 03/2011
CMPx_FPR field descriptions
SMELB
0
0
5
5
Preliminary
IER
0
0
4
4
FILT_PER
Description
Description
IEF
0
0
3
3
CFR
w1c
0
0
2
2
Freescale Semiconductor, Inc.
CFF
w1c
0
0
1
1
COUT
0
0
0
0