MC9S08QG8 Datasheet, PDF (110/300 Pages) Freescale Semiconductor, Inc – 8-BIT HCS08 Central Processor Unit

Analog Comparator (S08ACMPV2)
8.3.1 ACMP Status and Control Register (ACMPSC)
ACMPSC contains the status flag and control bits which are used to enable and configure the ACMP.
R
W
Reset:
7
ACME
0
6
ACBGS
5
ACF
4
ACIE
3
ACO
2
ACOPE
0
0
0
0
0
= Unimplemented
Figure 8-3. ACMP Status and Control Register
1
0
ACMOD
0
0
Table 8-2. ACMP Status and Control Register Field Descriptions
Field
7
ACME
6
ACBGS
5
ACF
4
ACIE
3
ACO
2
ACOPE
1:0
ACMOD
Description
Analog Comparator Module Enable — ACME enables the ACMP module.
0 ACMP not enabled
1 ACMP is enabled
Analog Comparator Bandgap Select — ACBGS is used to select between the bandgap reference voltage or
the ACMP+ pin as the input to the non-inverting input of the analog comparatorr.
0 External pin ACMP+ selected as non-inverting input to comparator
1 Internal reference select as non-inverting input to comparator
Analog Comparator Flag — ACF is set when a compare event occurs. Compare events are defined by ACMOD.
ACF is cleared by writing a one to ACF.
0 Compare event has not occurred
1 Compare event has occurred
Analog Comparator Interrupt Enable — ACIE enables the interrupt from the ACMP. When ACIE is set, an
interrupt will be asserted when ACF is set.
0 Interrupt disabled
1 Interrupt enabled
Analog Comparator Output — Reading ACO will return the current value of the analog comparator output. ACO
is reset to a 0 and will read as a 0 when the ACMP is disabled (ACME = 0).
Analog Comparator Output Pin Enable — ACOPE is used to enable the comparator output to be placed onto
the external pin, ACMPO.
0 Analog comparator output not available on ACMPO
1 Analog comparator output is driven out on ACMPO
Analog Comparator Mode — ACMOD selects the type of compare event which sets ACF.
00 Encoding 0 — Comparator output falling edge
01 Encoding 1 — Comparator output rising edge
10 Encoding 2 — Comparator output falling edge
11 Encoding 3 — Comparator output rising or falling edge
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01
110
Freescale Semiconductor