MC68HC908RF2CFA Freescale Semiconductor, MC68HC908RF2CFA Datasheet - Page 104

• Manufacturer Part Number: MC68HC908RF2CFA
• Description: IC MCU W/UHF TX 2K FLASH 32LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908RF2CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: LVD, POR, PWM, RF Mod
• Number Of I /o: 12
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

Low-Voltage Inhibit (LVI)
8.3.1 False Trip Protection
8.3.2 Short Stop Recovery Option
Data Sheet
104
NOTE:
In addition to forcing a reset condition, the LVI module has a second circuit
dedicated to low-voltage detection. When V
low-voltage comparator asserts the LOWV flag in the LVI status register (LVISR).
In applications that require detecting low batteries, software can monitor by polling
the LOWV bit.
The V
power supply noise. For the LVI module to reset due to a low-power supply, V
must remain at or below the V
See
The LVI has an enable time of t
and long stop recovery (both 4096 CGMXCLK cycles) gives a delay longer than the
LVI enable time for these startup scenarios. There is no period where the MCU is
not protected from a low-power condition. However, when using the short stop
recovery configuration option, the 32 CGMXCLK delay must be greater than the
LVI turn on time to avoid a period in startup where the LVI is not protecting the
MCU.
The LVI is enabled automatically after reset or stop recovery, if the LVISTOP of the
CONFIG register is set. (See
At Level:
V
V
V
V
DD
DD
DD
DD
Table
> V
< V
< V
< V
DD
Freescale Semiconductor, Inc.
LVR
LVR
LVR
LVR
For More Information On This Product,
pin level is digitally filtered to reduce false dead battery detection due to
8-1.
For Number of CGMXCLK Cycles:
Go to: www.freescale.com
Low-Voltage Inhibit (LVI)
< 32 CGMXCLK cycles
> 40 CGMXCLK cycles
V
Between 32 and 40
CGMXCLK cycles
DD
Table 8-1. LOWV Bit Indication
ANY
Section 3. Configuration Register
LVR
EN
. The system stabilization time for power-on reset
level for a minimum 32–40 CGMXCLK cycles.
DD
falls below V
No reset, continue counting CGMXCLK
LVI is guaranteed to generate
Filter counter remains clear
after 32 CGMXCLK cycles
LVI may generate a reset
MC68HC908RF2 — Rev. 4.0
LVS
Result
a reset
, the output of the
(CONFIG).)
MOTOROLA
DD