MC68HC908MR8 Datasheet, PDF (68/372 Pages) Motorola, Inc – Microcontrollers

Configuration Register (CONFIG)
5.3 CONFIG
The configuration register (CONFIG) is a write-once register. Once the
register is written, further writes will have no effect until a reset occurs.
5.4 CONFIG Bits
NOTE:
If the LVI module and the LVI reset signal are enabled, a reset occurs
when V_DD falls to a voltage, LVI_TRIPF, and remains at or below that level
for at least nine consecutive central processor unit (CPU) cycles. Once
an LVI reset occurs, the microcontroller unit (MCU) remains in reset until
V_DD rises to a voltage, LVI_TRIPR.
Address: $001F
Bit 7
Read:
EDGE
Write:
Reset
states:
CONFIG 0
6
BOT-
NEG
5
TOP-
NEG
4
3
INDEP LVIRST
2
LVIP-
WR
1
Bit 0
STOPE COPD
0
0
0
1
1
0
0
Figure 5-1. CONFIG Register
EDGE — Edge-Align Enable Bit
EDGE determines if the motor control PWM will operate in
edge-aligned mode or center-aligned mode. See Section 9.
Pulse-Width Modulator for Motor Control (PWMMC).
1 = Edge-aligned mode enabled
0 = Center-aligned mode enabled
BOTNEG — Bottom-Side PWM Polarity Bit
BOTNEG determines if the bottom-side PWMs will have positive or
negative polarity. See Section 9. Pulse-Width Modulator for Motor
Control (PWMMC).
1 = Negative polarity
0 = Positive polarity
Technical Data
68
Configuration Register (CONFIG)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor