ELAN Home Systems EM78P459AK manual Programming the Related Registers, Comparator Outputs

Page 41

EM78P458/459

OTP ROM

ComparatorX ( Comparator 1 and Comparator 2 ): To reset TMRX while a match occurs and the

TMRXIF flag is set at the same time.

3. Programming the Related Registers

When defining TMRX, refer to the related registers of its operation as shown in Table 9.It must be noted that the PWMX bits must be disabled if their related TMRXs are employed. That is, bit 7 and bit 6 of the PWMCON register must be set to ‘0’.

Table 10 Related Control Registers of TMR1 and TMR2

Address	Name	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
IOC51	PWMCON/IOC51	PWM2E	PWM1E	T2EN	T1EN	T2P1	T2P0	T1P1	T1P0

4.Timer programming procedures/steps

(1)Load PRDX with the TIMER period.

(2)Enable interrupt function by writing IOCF0, if required

(3)Load a desired value to PWMCON with the TMRX prescaler value and enable both TMRX and disable PWMX.

4.10Comparator

EM78P458/459 has one comparator, which has two analog inputs and one output. The comparator can be employed to wake up from the sleep mode. Fig. 16 shows the circuit of the comparator.

Cin- -

CMP

Cin+ +

CO

Fig. 16 Comparator Operating Mode

1. External Reference Signal

The analog signal that is presented at Cin- compares to the signal at Cin+, and the digital output (CO) of the comparator is adjusted accordingly.

•The reference signal must be between Vss and Vdd.

•The reference voltage can be applied to either pi of comparator.

•Threshold detector applications may be of the same reference.

•The comparator can operate from the same or different reference source.

2.Comparator Outputs

This specification is subject to change without prior notice.

41

07.01.2003 (V1.3)

Image 41

Contents BIT MICRO-CONTROLLER EM78P458/459Application Note EM78P458/459General Description Features EM78P458/459 PIN Assignment EM78P459 Pin Description Operational Registers Function DescriptionR0 Indirect Addressing Register R1 Time Clock /CounterProgram Counter Organization R4 RAM Select Register R3 Status RegisterR5 ~ R6 Port 5 ~ Port R7 ~ R8Data Memory Configuration RA Addata the converted value of ADC R9 Adcon Analog to Digital Control10. RB 11. RC13. RE Special Purpose RegistersRF Interrupt Status Register 15. R10 ~ R3FIOC50 ~ IOC60 I/O Port Control Register Control RegisterInte INT PAB PSR2 PSR1 PSR0 Bit 0 PSR0 ~ Bit 2 PSR2 TCC/WDT prescaler bitsVrefs COE IMS2 IMS1 IMS0 CKR1 CKR0 IOC90 Gcon I/O Configuration & Control of ADCOP2E OP1E IOCB0 Pull-down Control Register Description of AD Configuration Control BitsBit4Bit2 IMS2IMS0 IMS2IMS0IOCD0 Pull-high Control Register IOCC0 Open-Drain Control RegisterIOCF0 Interrupt Mask Register IOCE0 WDT Control RegisterWdte EIS Cmpie PWM2IE PWM1IE Adie Exie Icie TciePWM2E PWM1E T2EN T1EN IOC51 PwmconCALI1 SIGN1 IOC81 PRD1 Period of PWM1Bit 5Bit 3 VOF12VOF10 Offset voltage bits CALI2 SIGN2Bit 5Bit 3 VOF22VOF20 Offset voltage bits IOCB1 PRD2 Period of PWM2TCC/WDT & Prescaler I/O Ports Block Diagram of TCC and WDTCcircuit of I/O Port and I/O Control Register for Port Circuit of I/O Port and I/O Control Register for P60~P67 Usage of Port 6 Input Changed Wake-up/Interrupt Function Reset and Wake-upFunction of Reset and Wake-up Contw CLR R1 Status of T, and P of Status Register Status of RST, T and P being Affected by Events Values of RST, T, and P after ResetInterrupt Interrupt Input Circuit Analog-To-Digital Converter ADCBIT Symbol Vrefs COE IMS2 IMS1 IMS0 CKR1 CKR0 BIT Symbol Iocs Adrun Adpd ADIS2 ADIS1 ADIS0ADC Control Register ADCON/R9, AD-CMP-CON/IOCA0, GCON/IOC90 ADCON/R9CKR1 and CKR0 Bit 1 and Bit 0 The conversion time select ADC Data Register ADDATA/RAGCON/IOC90 Shows the Gains and the Operating Range of ADCD Sampling Time D Operation During Sleep ModeD Conversion Time Programming Steps/ConsiderationsCINT== 0XF Demonstration ProgramsIocs Adrun Adpd ADIS2 ADIS1 ADIS0 Overview Dual Sets of PWM Pulse Width Modulation Functional Block Diagram of the Dual PWMs Increment Timer Counter Tmrx TMR1H/TWR1L or TMR2H/TWR2LPWM Period Prdx PRD1 or PRD2 PWM Programming Procedures/StepsComparator Period = Prdx + 1 * 4 * 1/Fosc * Tmrx prescale valueFunction description TimerTMR1X and TMR2X TMR1H/TWR1L and TMR2H/TMR2L Prdx PRD1 and PRD2 PWM period registerExternal Reference Signal Timer programming procedures/stepsComparator Programming the Related RegistersInterrupt Using as An Operation AmplifierWake-up from Sleep Mode Summary of the Initialized Values for Registers Initialized Values after ResetCALI1 SIGN1 Oscillator Modes OscillatorSummary of Maximum Operating Speeds Crystal Oscillator/Ceramic Resonators XtalEM78P458 EM78P459LXT HXTEM78P458 EM78P459 VddExternal RC Oscillator Mode EM78P458 EM78P459 Vcc Rext RC Oscillator Mode with Internal CapacitorExternal Power on Reset Circuit Power-on ConsiderationsResidue-Voltage Protection EM78P458 EM78P459 RinEnwdt Clks PTB HLF RCT HLP Code Option Register WordBit 11 ~ Bit 9 VOF22~VOF20 Offset voltage bits Bit 5 ~ Bit 0 ID5~ID0 Customer’s IDList of the instruction set of EM78P458/459 Instruction SetADD A,R Reset Timing CLK=0 Timing DiagramsAC Test Input/Output Waveform TCC Input Timing CLKS=0Absolute Maximum Ratings Crystal type, two clocks Electrical CharacteristicsAC Electrical CharacteristicTa=0C ~ 70 C, VDD=5V±5%, VSS=0V ComparatorOP CharacteristicVdd = 5.0V,Vss=0V,Ta=0 toIVR Package Types AppendixOTP MCU DIP