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IBM EM78P447N manual 4.4 I/O Ports, a The I/O Port and I/O Control Register Circuit

Models: EM78P447N

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4.4 I/O Ports

EM78P447N

8-Bit Microcontroller with OTP ROM

4.4 I/O Ports

The I/O registers, Port 5, Port 6, and Port 7, are bi-directional tri-state I/O ports. The functions of Pull-high, R-option, and Open-drain can be performed internally by CONT and IOCE respectively. There is input status change wake-up function on Port 6, P74, and P75. Each I/O pin can be defined as "input" or "output" pin by the I/O control register (IOC5 ~ IOC7). The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 5, Port 6, and Port 7 are shown in Figures. 7(a) and (b) respectively.

PORT

		PCRD
	Q	PR	D
	Q	CLK		PCWR
	Q	CL
	Q	PR	D
			D	PDWR
	Q	CLK		PDWR
	Q	CL
0	M			PDRD
1	U
1	X

IOD

Fig. 7 (a) The I/O Port and I/O Control Register Circuit

VCC ROC

Weakly

Pull- up

PORT

Rex*

PCRD

Q PR D

CLK

Q CL

Q PR D

CLK

Q CL

0 M U 1 X

PCWR

IOD

PDWR

PDRD

*The Rex is 430K ohm external resistor

Fig.7 (b) The I/O Port with R-Option (P70, P71) Circuit

16 •	Product Specification (V1.1) 03.30.2005

(This specification is subject to change without further notice)

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IBM EM78P447N manual 4.4 I/O Ports, a The I/O Port and I/O Control Register Circuit

Contents

Product Specification EM78P447N8-Bit Microcontroller with OTP ROM ELAN MICROELECTRONICS CORPTrademark Acknowledgments Copyright 2005 by ELAN Microelectronics CorporationAll Rights Reserved ELAN MICROELECTRONICS CORPORATIONContents FEATURESSpecification Revision History DC ELECTRICAL CHARACTERISTICSDC Electrical Characteristic AC Electrical CharacteristicEM78P447N 2 FEATURES1 GENERAL DESCRIPTION Programmable free running watchdog timer EM78P447N3 PIN ASSIGNMENT This specification is subject to change without further noticeEM78P447N Fig. 1 Pin AssignmentTable 2 EM78P447NAS Pin Description EM78P447NTable 1 EM78P447NAP and EM78P447NAM Pin Description Table 4 EM78P447NCK and EN78P447NCM Pin Description EM78P447NTable 3 EM78P447NBP and EM78P447NBWM Pin Description 4 FUNCTION DESCRIPTION Fig. 2 Functional Block DiagramEM78P447N Table 5 EM78P447NDK and EM78P447NDM Pin Description4.1 Operational Registers 4.1.1 R0 Indirect Addressing Register4.1.2 R1 Time Clock /Counter 4.1.3 R2 Program Counter & StackReset Vector EM78P447NFig. 3 Program Counter Organization 00 PAGE0 0000~03FFFig. 4 Data Memory Configuration EM78P447N4.1.5 R4 RAM Select Register 4.1.6 R5~R7 Port 5 ~ Port74.1.7 R8~R1F and R20~R3E General Purpose Register EM78P447N4.2 Special Purpose Registers 4.1.8 R3F Interrupt Status Register4.2.1 A Accumulator 4.2.2 CONT Control RegisterEM78P447N 4.2.3 IOC5 ~ IOC7 I/O Port Control Register4.2.4 IOCB Wake-up Control Register for Port6 4.2.5 IOCE WDT Control Register EM78P447NEM78P447N 4.2.6 IOCF Interrupt Mask RegisterFig. 5 Sleep Mode and Wake-Up Circuits on I/O Ports Block Diagram EM78P447N 4.3 TCC/WDT & PrescalerFig. 6 TCC and WDT Block Diagram 4.4 I/O Ports EM78P447NFig. 7 a The I/O Port and I/O Control Register Circuit Fig.7 b The I/O Port with R-Option P70, P71 CircuitEM78P447N 4.5 RESET and Wake-up4.5.1 RESET EM78P447N Table 6 Usage of Sleep1 and Sleep2 ModeEM78P447N Table 7 The Summary of the Initialized Values for RegistersEM78P447N 0x09~0x3E4.5.2 The Status of RST, T, and P of STATUS Register EM78P447NEM78P447N 4.6 InterruptFig. 8 Controller Reset Block Diagram 4.7 Oscillator 4.7.1 Oscillator ModesEM78P447N Fig. 9 Interrupt Input Circuit4.7.2 Crystal Oscillator/Ceramic ResonatorsXTAL EM78P447NFig. 10 Crystal/Resonator Circuit Fig. 11 Crystal/Resonator CircuitFig. 12 External RC Oscillator Mode Circuit 4.7.3 External RC Oscillator ModeEM78P447N EM78P447N 4.8 CODE Option Register4.8.1 Code Option Register Word EM78P447N Bit 8 CLKS Instruction period option bit 0 two oscillator periods4.9 Power On Considerations 4.10 External Power On Reset CircuitRESET 4.8.2 Customer ID Register Word4.11 Residue-Voltage Protection Vdd EM78P447N RESETVdd EM78P447N RESET EM78P447N4.12 Instruction Set EM78P447NEM78P447N INSTRUCTIONMNEMONIC OPERATIONEM78P447N This instruction is applicable to IOC5 ~ IOC7, IOCB, IOCE, IOCF onlyThis instruction is not recommended for R3F operation This instruction cannot operate under R3F4.13 Timing Diagram This specification is subject to change without further noticeEM78P447N TEST POINTSDC ELECTRICAL CHARACTERISTICS DC Electrical Characteristic5 ABSOLUTE MAXIMUM RATINGS EM78P447NAC Electrical Characteristic EM78P447N 8-Bit Microcontroller with OTP ROM6.3 Device characteristic EM78P447NThis specification is subject to change without further notice EM78P447NFig.18 Port5, Port6 and Port7 Voh vs. Ioh,VDD=5VThis specification is subject to change without further notice EM78P447NVoh/Ioh VDD=3V IohmAThis specification is subject to change without further notice EM78P447NVol/Iol VDD=5V IolmAThis specification is subject to change without further notice EM78P447NVol/Iol VDD=3V IolmAThis specification is subject to change without further notice EM78P447NVol/Iol IolmAThis specification is subject to change without further notice EM78P447NVol/Iol IolmAWDT Timeout This specification is subject to change without further noticeEM78P447N periodEM78P447N R=3.3kR=5.1k R=10kICC1：VDD=3V, Fosc=32 kHz, 2clock, WDT disable EM78P447NFig. 28 Maximum Operating Current（ICC1 and ICC2） vs. Temperature Fig. 29 Typical Operating Current（ICC3 and ICC4） vs. TemperatureEM78P447N Max ICC2Maximum ICC3 and ICC4 vs. Temperature TemperatureFig. 30 Maximum Operating Current（ICC3 and ICC4） vs. Temperature Fig. 31 Typical Standby Current（ISB1 and ISB2） vs. TemperatureFig. 32 Maximum Standby Current（ISB1 and ISB2） vs. Temperature Fig. 33 Operating Voltage In Temperature Range from -40 toEM78P447N Max ISB2This specification is subject to change without further notice EM78P447NFig. 34 EM78P447N I-V Curve Operating at 4 MHz Fig. 35 EM78P447N I-V Curve Operating at 32.768 kHzAPPENDIX A Package Types B Package InformationEM78P447N 20-Lead plastic dual inline package（DIP）－ 300 milThis specification is subject to change without further notice EM78P447N24-Lead plastic dual inline skinny package（DIP）－ 300 mil 28-Lead plastic dual inline package（DIP）－ 600 milThis specification is subject to change without further notice EM78P447N32-Lead plastic dual inline package（DIP）－ 600 mil 20-Lead plastic small outline package（SOP）－ 300 milThis specification is subject to change without further notice EM78P447N24-Lead plastic small outline package（SOP）－ 300 mil 28-Lead plastic small outline package（SOP）－ 300 milThis specification is subject to change without further notice EM78P447N32-Lead plastic small outline package（SOP）－ 300 mil 28-Lead Shrink Small Outline Package（SSOP）－ 209 mil