MC68331CEH20 Freescale Semiconductor, MC68331CEH20 Datasheet - Page 70

• Manufacturer Part Number: MC68331CEH20
• Description: IC MCU 32BIT 20MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68331CEH20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Controller Family/series: 68K
• No. Of I/o's: 18
• Cpu Speed: 20MHz
• No. Of Timers: 1
• Embedded Interface Type: QSPI, SCI, UART
• No. Of Pwm Channels: 2
• Digital Ic Case Style: PQFP
• Rohs Compliant: Yes
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Data Ram Size: 80 B
• Interface Type: QSPI, SCI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 18
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Cpu Family: 68K/M683xx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 20MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 80Byte
• # I/os (max): 18
• Number Of Timers - General Purpose: 1
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 132
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

6 General-Purpose Timer Module
6.1 Overview
70
The 11-channel general-purpose timer (GPT) is used in systems where a moderate level of CPU control
is required. The GPT consists of a capture/compare unit, a pulse accumulator, and two pulse-width
modulators. A bus interface unit connects the GPT to the intermodule bus.
The capture/compare unit features three input capture channels, four output compare channels, and
one channel that can be selected as an input capture or output compare channel. These channels share
a 16-bit free-running counter (TCNT) which derives its clock from a nine-stage prescaler or from the ex-
ternal clock input signal, PCLK.
Pulse accumulator channel logic includes an 8-bit counter; the pulse accumulator can operate in either
event counting mode or gated time accumulation mode.
Pulse-width modulator outputs are periodic waveforms whose duty cycles can be independently select-
ed and modified by user software. The PWM circuits share a 16-bit free-running counter that can be
clocked by the same nine-stage prescaler used by the capture/compare unit or by the PCLK input.
All GPT pins can also be used for general-purpose input/output. The input capture and output compare
pins form a bidirectional 8-bit parallel port (PORTGP). PWM pins are outputs only. PAI and PCLK pins
are inputs only.
GPT input capture/output compare pins are bidirectional and can be used to form an 8-bit parallel port.
The pulse-width modulator outputs can be used as general-purpose outputs. The PAI and PCLK inputs
can be used as general-purpose inputs.
The GPT control register address map is shown below. The “Access” column in the GPT address map
indicates which registers are accessible only at the supervisor privilege level and which can be assigned
to either the supervisor or user privilege level, according to the value of the SUPV bit in the GPTMCR.
IC1/PGP0
IC3/PGP2
IC2/PGP1
Freescale Semiconductor, Inc.
For More Information On This Product,
CAPTURE/COMPARE UNIT
PULSE ACCUMULATOR
BUS INTERFACE
PRESCALER
Figure 15 GPT Block Diagram
PWM UNIT
Go to: www.freescale.com
IMB
OC1/PGP3
OC2/OC1/PGP4
OC3/OC1/PGP5
OC4/OC1/PGP6
IC4/OC5/OC1/PGP7
PAI
PWMA
PWMB
PCLK
GPT BLOCK
MC68331TS/D