MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 170

• 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

Functional Description
6.6.2.5 Quadrature-Count Mode
If CTRL[CM] is set to '100', the counter will decode the primary and secondary external
inputs as quadrature encoded signals. Quadrature signals are usually generated by rotary
or linear sensors used to monitor movement of motor shafts or mechanical equipment.
The quadrature signals are square waves that are 90 degrees out of phase. The decoding
of quadrature signal provides both count and direction information.
This figure shows a timing diagram illustrating the basic operation of a quadrature
incremental position encoder.
Example: 6.6.2.5.1 Quadrature Count Mode Example
>
170
//
//
//
//
//
//
void Pulse_Init(void)
{
}
/* TMRA0_CTRL: CM=0,PCS=0,SCS=1,ONCE=0,LENGTH=0,DIR=0,Co_INIT=0,OM=0 */
setReg(TMRC0_CTRL,0x80);
/* TMRA0_SCTRL: TCF=0,TCFIE=0,TOF=0,TOFIE=0,IEF=0,IEFIE=0,IPS=0,INPUT=0,
setReg(TMRA0_SCTRL,0x00);
setReg(TMRA0_CNTR,0x00);
setReg(TMRA0_LOAD,0x00);
setReg(TMRA0_COMP1,0xFFFF);
setReg(TMRA0_COMP2,0x00);
/* TMRA0_CSCTRL: ??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,
setReg(TMRA0_CSCTRL,0x00);
setRegBitGroup(TMRA0_CTRL,CM,0x04);
This example uses TMRA0 for counting states of a quadrature position encoder.
Timer input 0 is used as the primary count source (PHASEA).
Timer input 1 is used as the secondary count source (PHASEB).
(See Processor Expert PulseAccumulator bean.)
PHASEA
PHASEB
COUNT
Capture_Mode=0,MSTR=0,EEOF=0,VAL=0,FORCE=0,OPS=0,OEN=0 */
UP/DN
Figure 6-119. Quadrature Incremental Position Encoder
TCF2EN=0,TCF1EN=0,TCF2=0,TCF1=0,CL2=0,CL1=0 */
+1
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
+1
+1
+1
+1
/* Reset counter register */
/* Reset load register */
/* Set up mode */
/* Set up compare 1 register */
/* Set up compare 2 register */
/* Run counter */
+1
Preliminary
+1
+1
-1
-1
-1
-1
-1
-1
-1
-1
-1
Freescale Semiconductor
-1