MC68HC908BD48IFB Freescale Semiconductor, MC68HC908BD48IFB Datasheet - Page 147

• Manufacturer Part Number: MC68HC908BD48IFB
• Description: IC MCU 48K FLASH 6MHZ USB 44PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908BD48IFB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 6MHz
• Connectivity: I²C, USB
• Peripherals: POR, PWM
• Number Of I /o: 32
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

11.1 Contents
11.2 Introduction
11.3 Functional Description
MC68HC908BD48
Freescale Semiconductor
Data Sheet — MC68HC908BD48
—
Rev. 2.1
11.2
11.3
11.4
11.4.1
11.4.2
Sixteen 8-bits PWM channels are available on the MC68HC908BD48.
Channels 0 to 7 are shared with port-B I/O pins under the control of the
PWM control register 1. Channels 8 to 15 are shared with port-A I/O pins
under the control of the PWM control register 2.
Each 8-bit PWM channel is composed of an 8-bit register which contains
a 5-bit PWM in MSB portion and a 3-bit binary rate multiplier (BRM) in
LSB portion. There are 16 PWM data registers as shown in
The value programmed in the 5-bit PWM portion will determine the pulse
length of the output. The clock to the 5-bit PWM portion is the system
clock, the repetition rate of the output is hence 187.5KHz at 6MHz clock.
The 3-bit BRM will generate a number of narrow pulses which are
equally distributed among an 8-PWM-cycle frame. The number of pulses
generated is equal to the number programmed in the 3-bit BRM portion.
Examples of the waveforms are shown in
Section 11. Pulse Width Modulator (PWM)
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
PWM Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147
PWM Data Registers 0 to 15 (0PWM–15PWM). . . . . . . . . 150
PWM Control Registers 1 and 2 (PWMCR1:PWMCR2) . . 151
Pulse Width Modulator (PWM)
Figure
11-3.
Table
Data Sheet
11-1.
147