MC68HC908GZ8VFA Freescale Semiconductor, MC68HC908GZ8VFA Datasheet - Page 269

• Manufacturer Part Number: MC68HC908GZ8VFA
• Description: IC MCU 8K FLASH 8MHZ CAN 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GZ8VFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: CAN, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 37
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

TOVx — Toggle On Overflow Bit
CHxMAX — Channel x Maximum Duty Cycle Bit
Freescale Semiconductor
When channel x is an output compare channel, this read/write bit controls the behavior of the channel x
output when the TIM counter overflows. When channel x is an input capture channel, TOVx has no
effect. Reset clears the TOVx bit.
When the TOVx bit is at logic 1, setting the CHxMAX bit forces the duty cycle of buffered and
unbuffered PWM signals to 100%. As
after it is set or cleared. The output stays at the 100% duty cycle level until the cycle after CHxMAX is
cleared.
1 = Channel x pin toggles on TIM counter overflow.
0 = Channel x pin does not toggle on TIM counter overflow.
MSxB:MSxA ELSxB:ELSxA
X0
X1
00
00
00
01
01
01
1X
1X
1X
Before enabling a TIM channel register for input capture operation, make
sure that the PTD/TCHx pin is stable for at least two bus clocks.
When TOVx is set, a TIM counter overflow takes precedence over a
channel x output compare if both occur at the same time.
CHxMAX
TCHx
OVERFLOW
00
00
01
10
11
01
10
11
01
10
11
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Table 19-3. Mode, Edge, and Level Selection
COMPARE
PERIOD
OUTPUT
Figure 19-12. CHxMAX Latency
OVERFLOW
Output compare
Buffered output
or buffered
compare
or PWM
capture
Output
preset
Mode
PWM
Figure 19-12
Input
COMPARE
OUTPUT
NOTE
NOTE
OVERFLOW
Pin under port control; initial output level high
Pin under port control; initial output level low
Capture on rising edge only
Capture on falling edge only
Capture on rising or falling edge
Toggle output on compare
Clear output on compare
Set output on compare
Toggle output on compare
Clear output on compare
Set output on compare
shows, the CHxMAX bit takes effect in the cycle
COMPARE
OUTPUT
OVERFLOW
Configuration
COMPARE
OUTPUT
OVERFLOW
I/O Registers
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