MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 157

• Manufacturer Part Number: MC68HC908LB8CPE
• Description: IC MCU 8K FLASH 8MHZ 20DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908LB8CPE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVR, POR, PWM
• Number Of I /o: 18
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 7x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -

LDFQ1 and LDFQ0 — PWM Load Frequency Bits
DIS1 — Software Disable Bit for PWM1
DIS0 — Software Disable Bit for PWM0
POL1 — Polarity Bit for PWM1
Freescale Semiconductor
These buffered read/write bits select the PWM CPU load frequency according to
This read/write bit allows the user to disable pin PWM1.
This read/write bit allows the user to disable pin PWM0.
This read/write bit selects the polarity of the PWM waveform of PWM1. Positive polarity means that
when the PWM is active the PWM output is high. Conversely, negative polarity means that when the
PWM is active the PWM output is low.
1 = Disable PWM1
0 = Re-enable PWM1
1 = Disable PWM0
0 = Re-enable PWM0
1 = PWM1 has positive polarity
0 = PWM1 has negative polarity
Address:
When reading these bits, the value read is the buffer value (not necessarily
the value the PWM generator is currently using).
The LDFQx bits take effect when the current load cycle is complete
regardless of the state of the load okay bit, LDOK.
Reading the LDFQx bit reads the buffered values and not necessarily the
values currently in effect.
Reset:
Read:
Write:
LDFQ1
$0041
Bit 7
Bold
0
Figure 15-21. PWM Control Register 2 (PCTL2)
Reload Frequency Bits
LDFQ1 and LDFQ0
= Buffered
LDFQ0
Table 15-4. PWM Reload Frequency
6
0
MC68HC908LB8 Data Sheet, Rev. 1
00
01
10
11
DIS1
5
0
NOTE
NOTE
DIS0
4
0
POL1
Every 2 PWM cycles
Every 4 PWM cycles
Every 8 PWM cycles
3
1
Every PWM cycle
PWM Reload
Frequency
POL0
2
1
PRSC1
1
0
Table
PRSC0
Control Logic Block
Bit 0
0
15-4.
157