Crystal Oscillator/Ceramic Resonators Crystal | IBM EM78P259N/260N

EM78P259N/260N

8-Bit Microprocessor with OTP ROM

6.11.2 Crystal Oscillator/Ceramic Resonators (Crystal)

The EM78P259N/260N can be driven by an external clock signal through the OSCI pin as illustrated below.

OSCI

EM78P259N

EM78P260N

OSCO

Fig. 6-16 External Clock Input Circuit

In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or ceramic resonator to generate oscillation. Fig. 6-17 below depicts such a circuit. The same applies to the HXT mode and the LXT mode.

		C1
OSCI
EM78P259N
EM78P260N	Crystal
OSCO
	RS	C2
Fig. 6-17	Crystal/Resonator Circuit

The following table provides the recommended values for C1 and C2. Since each resonator has its own attribute, you should refer to the resonator specifications for the appropriate values of C1 and C2. RS, a serial resistor, may be required for AT strip cut crystal or low frequency mode.

Capacitor selection guide for crystal oscillator or ceramic resonators:

Oscillator Type	Frequency Mode	Frequency	C1(pF)	C2(pF)
		455kHz	100~150	100~150
Ceramic Resonators	HXT	2.0 MHz	20~40	20~40
		4.0 MHz	10~30	10~30
		32.768kHz	25	15
	LXT	100kHz	25	25
		200kHz	25	25
Crystal Oscillator		455kHz	20~40	20~150
	HXT	1.0 MHz	15~30	15~30
	HXT	2.0 MHz	15	15
		2.0 MHz	15	15
		4.0 MHz	15	15

62 •	Product Specification (V1.2) 05.18.2007
	(This specification is subject to change without further notice)

Image 68

IBM EM78P259N/260N manual Crystal Oscillator/Ceramic Resonators Crystal, Oscillator Type, Frequency C1pF C2pF

Contents

EM78P259N/260N Elan Microelectronics Corporation Contents Reset and Wake-up TCC/WDT and PrescalerAnalog-To-Digital Converter ADC 6.1 11.1 11.211.3 11.4 Doc. Version Revision Description Date Bit Microprocessor with OTP ROM FeaturesGeneral Description Block Diagram Pin AssignmentPin DIP/SOP Pin DIP/SOP/SSOP EM78P259NP/M Symbol Pin No Type FunctionPin Description EM78P260NP/M/KM Function Description Operational Registers1 R0 Indirect Address Register 2 R1 Time Clock /Counter EM78P259N/260N Bit Microprocessor with OTP ROM Data Memory Configuration Cont 5 R4 RAM Select Register Bit 4 TBit Bits 5~0 Bit 7 ~ Bit 4 C3 ~ C0 Calibrator of internal RC mode 6 R5 ~ R6 Port 5 ~ Port7 R7 Port Bit 7 ~ Bit 8 R8 Aisr ADC Input Select Register 9 R9 Adcon ADC Control Register Bit 3 Adpd RA Adoc ADC Offset Calibration Register RB Addata Converted Value of ADCBit 5 ~ Bit 3 VOF2 ~ VOF0 Offset voltage bits Bit 2 ~ Bit 0 Unimplemented, read as ‘0’ RE Interrupt Status 2 & Wake-up Control Register RC ADDATA1H Converted Value of ADCRD ADDATA1L Converted Value of ADC All of these are 8-bit general-purpose registers RF Interrupt Status 2 Register16 R10 ~ R3F Control Register Special Purpose RegistersAccumulator 3 IOC50 ~ IOC70 I/O Port Control Register 4 IOC80 Comparator and Tcca Control RegisterBit 7 & Bit 6 Not used Bit 4 & Bit 3 COS1 & COS0 Comparator/OP Select bits Bit 6 Tccben Tccb enable bit 0 = disable Tccb Bit 4 Tccbte Tccb signal edgeTccc signal source Bit 0 Tcccte Tccc signal edge IOCA0 IR and Tccc Scale Control Register Bit 3 IRE Bit 2 HFBit 1 LGP Bit 0 Iroute IOCB0 Pull-down Control Register IOCC0 Open-Drain Control RegisterBit PD57 PD56 PD55 PD54 PD53 PD52 PD51 PD50 Bit OD67 OD66 OD65 OD64 OD63 OD62 OD61 OD60 Bit PH57 PH56 PH55 PH54 PH53 PH52 PH51 PH50 IOCD0 Pull-high Control RegisterIOCE0 WDT Control & Interrupt Mask Registers Lpwtif interrupt enable bit = Disable Lpwtif interrupt= Enable Lpwtif interrupt IOCF0 Interrupt Mask Register 12 IOC51 Tcca Counter 13 IOC61 Tccb Counter 14 IOC71 TCCBH/MSB Counter 15 IOC81 Tccc Counter IOCB1 High/Low Time Scale Control Register 16 IOC91 Low Time RegisterIOCA1 High Time Register TCC prescaler counter can be read and written to IOCC1 TCC Prescaler CounterBit 2 ~ Bit 0 LTS2 ~ LTS0 Low time scale bits TCC/WDT and Prescaler I/O Ports MUX I/O Port and I/O Control Register Circuit for P60 /INT I/O Port and I/O Control Register Circuit for Port 50 ~ P57 Reset and Wake-up Reset and Wake-up OperationUsage of Port 5 Input Change Wake-up/Interrupt Function Wake-up Wake-up and Interrupt EM78P259N/260N Select Segment Signal Sleep Mode Normal Mode Comparator Address Name Reset Type Bit Following summarizes the initialized values for registers Name Reset Type Bit HTR7 HTR6 HTR5 HTR4 HTR3 HTR2 HTR1 HTR0 Aisr Controller Reset Block Diagram Tcif Event InterruptT and P Status under Status R3 Register EM78P259N/260N Reti Interrupt Vector Interrupt Status Priority Analog-to-Digital Converter ADC ADC Control Register AISR/R8, ADCON/R9, ADOC/RA1.1 R8 Aisr ADC Input Select Register Bit 7 ~ Bit 3 ADE3 Bit 2 ADE2 P54 1.2 R9 Adcon AD Control RegisterP54/TCC/VREF Pin Priority High Medium Low RA Adoc AD Offset Calibration Register While the CPU is operating= ADC is operating ADC Operation during Sleep Mode ADC Data Register ADDATA/RB, ADDATA1H/RC, ADDATA1L/RDADC Sampling Time AD Conversion Time Follow these steps to obtain data from the ADC Programming Process/ConsiderationsProgramming Process Sample Demo Programs Define a General Register Define a Control RegisterADC Control Register Define Bits in Adcon AD power on Infrared Remote Control Application/PWM Waveform Generation Overview Function Description Fcarrier IRE Irout Address Name Bit Programming the Related RegistersIR/PWM Related Status/Data Registers EM78P259N/260N Under Tccb Counter IOC61 Timer/CounterUnder Tcca Counter IOC51 Under Tccc Counter IOC81 Comparator Related Tccx Status/Data Registers External Reference Signal Comparator Output Comparator Interrupt Using a Comparator as an Operation AmplifierWake-up from Sleep Mode Oscillator Oscillator ModesOscillator Modes Conditions Frequency C1pF C2pF Crystal Oscillator/Ceramic Resonators CrystalOscillator Type External RC Oscillator Mode 18 Serial Mode Crystal/Resonator Circuit Diagram Internal RC Oscillator Mode Internal Drift Rate RC Frequency TemperatureCext Rext Average Fosc 5V, 25C Average Fosc 3V, 25C 40C ~ +85C 3V~5.5V Total Programmable WDT Time-out Period Power-on ConsiderationsExternal Power-on Reset Circuit Residual Voltage Protection VddEM78P259N EM78P260N Code Option Code Option Register WordWord Word1 Bit12 ~ Bit0 Word Bit Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit = Pulses equal to 8/fc s is regarded as signal = Pulses equal to 32/fc s is regarded as signal defaultBit Microprocessor with OTP ROM Bit 3 HLP Bit 2 ~ 0 PR2 ~ PR0 Protect Bits Customer ID Register Word Bit 1 & Bit 0 RCM1, RCM0 RC mode selection bitsInstruction Set Mnemonic Operation Status Affected Following are the EM78P259N/260N instruction setInstruction Binary Absolute Maximum Ratings Items Rating Ta=25 C, VDD=5.0V±5%, VSS=0V DC Electrical CharacteristicsSymbol Parameter Condition Min Typ Max Unit Internal RC Drift Rate Voltage Min Typ Max AD Converter Characteristics Vdd=2.5V to 5.5V, Vss=0V, Ta=25C Vdd = 5.0V, Vss=0V, Ta=25C Comparator OP CharacteristicsDevice Characteristics Ta=25C, VDD=5V±5%, VSS=0V AC Electrical CharacteristicSymbol Parameter Conditions Min Typ Max Unit Timing Diagrams Reset Timing CLK=0AC Test Input/Output Waveform TCC Input Timing CLKS=0 Package Type Package Information18-Lead Plastic Dual in line Pdip 300 mil Package Type Pin Count Package Size 18-Lead Plastic Small Outline SOP 300 mil 838 Lead Plastic Shrink Small Outline Ssop 209 mil 650 Lead Plastic Dual-in-line Pdip 300 mil Lead Plastic Small Outline SOP 300 mil Test Category Test Conditions Remarks Quality Assurance and ReliabilityAddress Trap Detect