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IBM EM78P447N manual Oscillator Modes, Interrupt Input Circuit

Models: EM78P447N

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Fig. 9 Interrupt Input Circuit

EM78P447N

8-Bit Microcontroller with OTP ROM

	VCC
	D	P	Q
/IRQn	D	R	Q
/IRQn	CLK		_
		C	Q
	RF	L
	RF

/RESET

IRQn

INT

RFRD IRQm

ENI/DISI

		Q	P	D				IOD
			R
			R
		_	C CLK
		_	C CLK			IOCFWR
IOCF		Q	L

IOCFRD

RFWR

Fig. 9 Interrupt Input Circuit

4.7 Oscillator

4.7.1 Oscillator Modes

The EM78P447N can operate in three different oscillator modes, i.e., high XTAL (HXT) oscillator mode, low XTAL (LXT) oscillator mode, and External RC oscillator mode (ERC) oscillator mode. User can select one of them by programming MS, HLF and HLP in the Code Option Register. Table 10 depicts how these three modes are defined.

The maximum limit for operational frequencies of crystal/resonator under different VDDs is listed in Table 10.

Table 10 Oscillator Modes Defined by MS and HLP

Mode		MS
ERC(External RC oscillator mode)		0
HXT(High XTAL oscillator mode)		1
LXT(Low XTAL oscillator mode)		1

HLF

*X

1

0

HLP

*X

*X

0

NOTE

1.X, Don’t care

2.The transient point of system frequency between HXT and LXY is around 400 KHz.

Product Specification (V1.1) 03.30.2005

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(This specification is subject to change without further notice)

Image 27

IBM EM78P447N manual Oscillator Modes, Interrupt Input Circuit

Contents

ELAN MICROELECTRONICS CORP Product SpecificationEM78P447N 8-Bit Microcontroller with OTP ROMELAN MICROELECTRONICS CORPORATION Trademark AcknowledgmentsCopyright 2005 by ELAN Microelectronics Corporation All Rights ReservedFEATURES ContentsAC Electrical Characteristic Specification Revision HistoryDC ELECTRICAL CHARACTERISTICS DC Electrical Characteristic2 FEATURES 1 GENERAL DESCRIPTIONEM78P447N EM78P447N Programmable free running watchdog timerFig. 1 Pin Assignment 3 PIN ASSIGNMENTThis specification is subject to change without further notice EM78P447NEM78P447N Table 1 EM78P447NAP and EM78P447NAM Pin DescriptionTable 2 EM78P447NAS Pin Description EM78P447N Table 3 EM78P447NBP and EM78P447NBWM Pin DescriptionTable 4 EM78P447NCK and EN78P447NCM Pin Description Table 5 EM78P447NDK and EM78P447NDM Pin Description 4 FUNCTION DESCRIPTIONFig. 2 Functional Block Diagram EM78P447N4.1.3 R2 Program Counter & Stack 4.1 Operational Registers4.1.1 R0 Indirect Addressing Register 4.1.2 R1 Time Clock /Counter00 PAGE0 0000~03FF Reset VectorEM78P447N Fig. 3 Program Counter OrganizationEM78P447N Fig. 4 Data Memory ConfigurationEM78P447N 4.1.5 R4 RAM Select Register4.1.6 R5~R7 Port 5 ~ Port7 4.1.7 R8~R1F and R20~R3E General Purpose Register4.2.2 CONT Control Register 4.2 Special Purpose Registers4.1.8 R3F Interrupt Status Register 4.2.1 A Accumulator4.2.3 IOC5 ~ IOC7 I/O Port Control Register 4.2.4 IOCB Wake-up Control Register for Port6EM78P447N EM78P447N 4.2.5 IOCE WDT Control Register4.2.6 IOCF Interrupt Mask Register Fig. 5 Sleep Mode and Wake-Up Circuits on I/O Ports Block DiagramEM78P447N 4.3 TCC/WDT & Prescaler Fig. 6 TCC and WDT Block DiagramEM78P447N Fig.7 b The I/O Port with R-Option P70, P71 Circuit 4.4 I/O PortsEM78P447N Fig. 7 a The I/O Port and I/O Control Register Circuit4.5 RESET and Wake-up 4.5.1 RESETEM78P447N Table 6 Usage of Sleep1 and Sleep2 Mode EM78P447NTable 7 The Summary of the Initialized Values for Registers EM78P447N0x09~0x3E EM78P447NEM78P447N 4.5.2 The Status of RST, T, and P of STATUS Register4.6 Interrupt Fig. 8 Controller Reset Block DiagramEM78P447N Fig. 9 Interrupt Input Circuit 4.7 Oscillator4.7.1 Oscillator Modes EM78P447NFig. 11 Crystal/Resonator Circuit 4.7.2 Crystal Oscillator/Ceramic ResonatorsXTALEM78P447N Fig. 10 Crystal/Resonator Circuit4.7.3 External RC Oscillator Mode EM78P447NFig. 12 External RC Oscillator Mode Circuit 4.8 CODE Option Register 4.8.1 Code Option Register WordEM78P447N Bit 8 CLKS Instruction period option bit 0 two oscillator periods EM78P447N4.8.2 Customer ID Register Word 4.9 Power On Considerations4.10 External Power On Reset Circuit RESETEM78P447N 4.11 Residue-Voltage ProtectionVdd EM78P447N RESET Vdd EM78P447N RESETEM78P447N 4.12 Instruction SetOPERATION EM78P447NINSTRUCTION MNEMONICThis instruction cannot operate under R3F EM78P447NThis instruction is applicable to IOC5 ~ IOC7, IOCB, IOCE, IOCF only This instruction is not recommended for R3F operationTEST POINTS 4.13 Timing DiagramThis specification is subject to change without further notice EM78P447NEM78P447N DC ELECTRICAL CHARACTERISTICSDC Electrical Characteristic 5 ABSOLUTE MAXIMUM RATINGSEM78P447N 8-Bit Microcontroller with OTP ROM AC Electrical CharacteristicEM78P447N 6.3 Device characteristicand Port7 Voh vs. Ioh,VDD=5V This specification is subject to change without further noticeEM78P447N Fig.18 Port5, Port6IohmA This specification is subject to change without further noticeEM78P447N Voh/Ioh VDD=3VIolmA This specification is subject to change without further noticeEM78P447N Vol/Iol VDD=5VIolmA This specification is subject to change without further noticeEM78P447N Vol/Iol VDD=3VIolmA This specification is subject to change without further noticeEM78P447N Vol/IolIolmA This specification is subject to change without further noticeEM78P447N Vol/Iolperiod WDT TimeoutThis specification is subject to change without further notice EM78P447NR=10k EM78P447NR=3.3k R=5.1kEM78P447N ICC1：VDD=3V, Fosc=32 kHz, 2clock, WDT disableMax ICC2 Fig. 28 Maximum Operating Current（ICC1 and ICC2） vs. TemperatureFig. 29 Typical Operating Current（ICC3 and ICC4） vs. Temperature EM78P447NFig. 31 Typical Standby Current（ISB1 and ISB2） vs. Temperature Maximum ICC3 and ICC4 vs. TemperatureTemperature Fig. 30 Maximum Operating Current（ICC3 and ICC4） vs. TemperatureMax ISB2 Fig. 32 Maximum Standby Current（ISB1 and ISB2） vs. TemperatureFig. 33 Operating Voltage In Temperature Range from -40 to EM78P447NFig. 35 EM78P447N I-V Curve Operating at 32.768 kHz This specification is subject to change without further noticeEM78P447N Fig. 34 EM78P447N I-V Curve Operating at 4 MHz20-Lead plastic dual inline package（DIP）－ 300 mil APPENDIX A Package TypesB Package Information EM78P447N28-Lead plastic dual inline package（DIP）－ 600 mil This specification is subject to change without further noticeEM78P447N 24-Lead plastic dual inline skinny package（DIP）－ 300 mil20-Lead plastic small outline package（SOP）－ 300 mil This specification is subject to change without further noticeEM78P447N 32-Lead plastic dual inline package（DIP）－ 600 mil28-Lead plastic small outline package（SOP）－ 300 mil This specification is subject to change without further noticeEM78P447N 24-Lead plastic small outline package（SOP）－ 300 mil28-Lead Shrink Small Outline Package（SSOP）－ 209 mil This specification is subject to change without further noticeEM78P447N 32-Lead plastic small outline package（SOP）－ 300 mil