MC9S08QD4_07 Datasheet, PDF (67/202 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

Chapter 5 Resets, Interrupts, and General System Control
Table 5-12. SPMSC1 Register Field Descriptions (continued)
Field
5
LVDIE
4
LVDRE
3
LVDSE
2
LVDE
0
BGBE
Description
Low-Voltage Detect Interrupt Enable — This bit enables hardware interrupt requests for LVDF.
0 Hardware interrupt disabled (use polling).
1 Request a hardware interrupt when LVDF = 1.
Low-Voltage Detect Reset Enable — This write-once bit enables LVDF events to generate a hardware reset
(provided LVDE = 1).
0 LVDF does not generate hardware resets.
1 Force an MCU reset when LVDF = 1.
Low-Voltage Detect Stop Enable — Provided LVDE = 1, this read/write bit determines whether the low-voltage
detect function operates when the MCU is in stop mode.
0 Low-voltage detect disabled during stop mode.
1 Low-voltage detect enabled during stop mode.
Low-Voltage Detect Enable — This write-once bit enables low-voltage detect logic and qualifies the operation
of other bits in this register.
0 LVD logic disabled.
1 LVD logic enabled.
Bandgap Buffer Enable — This bit enables an internal buffer for the bandgap voltage reference for use by the
ADC module on one of its internal channels.
0 Bandgap buffer disabled.
1 Bandgap buffer enabled.
5.8.9 System Power Management Status and Control 2 Register
(SPMSC2)
This high-page register contains status and control bits to configure the stop mode behavior of the MCU.
See Section 3.6, “Stop Modes,” for more information on stop modes.
R
W
POR:
LVDR:
Other
Reset
7
LVWF
0²
0²
0²
6
0
LVWACK
0
0
5
LVDV
0
U
4
LVWV
0
U
0
U
U
= Unimplemented or Reserved
3
PPDF
0
0
0
2
1
0
PPDACK
0
0
0
0
0
0
U = Unaffected by reset
0
PPDC¹
0
0
0
1 _{This bit can be written only one time after reset. Additional writes are ignored.}
2 _{LVWF will be set in the case when Vsupply transitions below the trip point or after reset and Vsupply is already below VLVW.}
Figure 5-11. System Power Management Status and Control 2 Register (SPMSC2)
MC9S08QD4 Series MCU Data Sheet, Rev. 3
Freescale Semiconductor
67