MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 167

• Manufacturer Part Number: MC56F8257MLH
• Description: DSC 64K FLASH 60MHZ 64-LQFP
• Manufacturer: Freescale Semiconductor
• Series: 56F8xxxr

Specifications of MC56F8257MLH

• Core Processor: 56800E
• Core Size: 16-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Ram Size: 4K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x12b, D/A 1x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 64-LQFP
• Product: DSCs
• Processor Series: 56800E
• Core: 56800E
• Device Million Instructions Per Second: 60 MIPs
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 54
• Data Ram Size: 8 KB
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

6.6.2 Functional Modes
The selected external count signals are sampled at the TMR's base clock rate and then run
through a transition detector. The maximum count rate is one-half of the TMR's base
clock rate. Internal clock sources can be used to clock the counters at the TMR's base
clock rate.
If a counter is programmed to count to a specific value and then stop, the CTRL[CM]
field is cleared when the count terminates.
>
6.6.2.1 Stop Mode
If CTRL[CM] is set to '000', the counter is inert. No counting will occur. Stop mode will
also disable the interrupts caused by input transitions on a selected input pin.
>
6.6.2.2 Count Mode
If CTRL[CM] is set to '001', the counter will count the rising edges of the selected clock
source. This mode is useful for generating periodic interrupts for timing purposes, or
counting external events such as "widgets" on a conveyor belt passing a sensor. If the
selected input is inverted by setting SCTRL[IPS] (input polarity select), then the negative
edge of the selected external input signal is counted.
Example: 6.6.2.2.1 Count Pulses from External Source
Freescale Semiconductor
//
//
//
//
void Pulse_Init(void)
{
}
/* TMRA1_CTRL: CM=0,PCS=3,SCS=0,ONCE=0,LENGTH=0,DIR=0,Co_INIT=0,OM=0 */
setReg(TMRA1_CTRL,0x0600);
/* TMRA1_SCTRL: TCF=0,TCFIE=0,TOF=0,TOFIE=0,IEF=0,IEFIE=0,IPS=0,INPUT=0,
setReg(TMRA1_SCTRL,0x00);
setReg(TMRA1_CNTR,0x00);
setReg(TMRA1_LOAD,0x00);
setRegBitGroup(TMRA1_CTRL,CM,0x01);
This example uses TMRA1 to count pulse (actually counts rising edges of the pulse)
from an external source (TA3).
(See Processor Expert PulseAccumulator bean.)
Capture_Mode=0,MSTR=0,EEOF=0,VAL=0,FORCE=0,OPS=0,OEN=0 */
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
/* Set up mode */
/* Reset counter register */
/* Reset load register */
/* Run counter */
Preliminary
Chapter 6 Quad Timer (TMR)
167