IBM EM78P447N Crystal Oscillator/Ceramic ResonatorsXTAL, Summary of Maximum Operating Speeds

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EM78P447N

8-Bit Microcontroller with OTP ROM

Table 11 The Summary of Maximum Operating Speeds

Conditions

VDD

Fxt max.(MHz)

Two cycles with two clocks

2.3	4.0
3.0	8.0
5.0	20.0

4.7.2 Crystal Oscillator/Ceramic Resonators(XTAL)

EM78P447N can be driven by an external clock signal through the OSCI pin as shown in Fig. 10 below.

In most applications, Pin OSCI and Pin OSCO can be connected with a crystal or ceramic resonator to generate oscillation. Fig. 12 depicts such circuit. The same thing applies whether it is in the HXT mode or in the LXT mode. Table 12 provides the recommended values of C1 and C2. Since each resonator has its own attribute, user should refer to its specification for appropriate values of C1 and C2. RS. A serial resistor may be necessary for AT strip cut crystal or low frequency mode.

OSCI

OSCO

EM 78P447S

Ext. Clock

Fig. 10 Crystal/Resonator Circuit

OSCI

EM 78P447S

OSCO

	C1
XTAL
RS	C2
RS

Fig. 11 Crystal/Resonator Circuit

24 •	Product Specification (V1.1) 03.30.2005

(This specification is subject to change without further notice)

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Contents EM78P447N Elan Microelectronics Corporation Contents Specification Revision History General Description EM78P447NBWM PIN Assignment EM78P447NAP and EM78P447NAM Pin Description Symbol Pin No Type FunctionEM78P447NAS Pin Description EM78P447NBP and EM78P447NBWM Pin Description Power supplyEM78P447NCK and EN78P447NCM Pin Description Function Description EM78P447NDK and EM78P447NDM Pin DescriptionOperational Registers 1 R0 Indirect Addressing Register2 R1 Time Clock /Counter 3 R2 Program Counter & StackCall RET Retl Reti FffhData Memory Configuration 5 R4 RAM Select Register 6 R5~R7 Port 5 ~ Port77 R8~R1F and R20~R3E General Purpose Register R5, R6 and R7 are I/O registersSpecial Purpose Registers 8 R3F Interrupt Status RegisterAccumulator Control Register3 IOC5 ~ IOC7 I/O Port Control Register Iocb Wake-up Control Register for Port6TCC Rate WDT RateIoce WDT Control Register WUEIocf Interrupt Mask Register ExieTCC and WDT Block Diagram TCC/WDT & PrescalerI/O Ports IODReset and Wake-up ResetUsage of Sleep1 and Sleep2 Mode SLEEP2 SLEEP1Address Name Reset Type Bit Summary of the Initialized Values for RegistersR3FISR Exif TcifWUE7 WUE6 WUE5 WUE4 IocbPrevious status before reset Previous value before resetStatus of RST, T, and P of Status Register Events that may Affect the T and P StatusController Reset Block Diagram InterruptOscillator Modes OscillatorMode Crystal Oscillator/Ceramic ResonatorsXTAL Summary of Maximum Operating SpeedsConditions Fxt max.MHzExternal RC Oscillator Mode Oscillator Type Frequency Mode C1pF C2pFHXT LXTCode Option Register Code Option Register WordPR2~PR0 are protect bits, protect type as following ProtectPower On Considerations External Power On Reset CircuitCustomer ID Register Word Bit 12~0 Customer’s ID codeReset Residue-Voltage ProtectionInstruction Set NOP DAAContw SlepDjza R DJZ RRrca R RRC RTiming Diagram AC Test Input/Output W aveformDC Electrical Characteristic Symbol Parameter Condition Min Typ Max UnitTa= 25 C, VDD= 5.0V±5%, VSS= Items RatingSymbol Parameter Conditions Min Typ Max Unit AC Electrical CharacteristicTa=- -40 C ~ 85 C, VDD=5V ±5%, VSS=0V Device characteristic Vih, Vil of TCC, /INT, /RESET PinPort5, Port6 Port7 Voh vs. Ioh,VDD=5V Port5, Port6, and Port7 Voh vs. Ioh, VDD=3V Vol/Iol VDD=5V Vol/Iol VDD=3V Vol/Iol 100 Vol/Iol WDT Cext=100pF, Typical RC OSC Frequency Typical ICC1 and ICC2 vs. Temperature Maximum ICC1 and ICC2 vs. Temperature Typical ISB1 and ISB2 vs. Temperature Maximum ISB1 and ISB2 vs. Temperature EM78P447N HXT ImA Lead plastic dual inline package（DIP）－ 300 mil Package Type Pin Count Package SizeLead plastic dual inline skinny package（DIP）－ 300 mil Lead plastic dual inline package（DIP）－ 600 mil838 27TYP EM78P447N