Manuals / IBM / Computer Equipment / Network Card

IBM manual Residue-Voltage Protection, Vdd EM78P447N RESET, Vdd R1 Q1 40KR2, Vdd 33K, 40K1N4684

Models: EM78P447N

1 58

Download 58 pages 20.07 Kb

Page 33

Image 33

EM78P447N

8-Bit Microcontroller with OTP ROM

4.11 Residue-Voltage Protection

When battery is replaced, device power (Vdd) is taken off but residue-voltage remains. The residue-voltage may trips below Vdd minimum, but not to zero. This condition may cause a poor power on reset. Fig.16 and Fig.17 show how to build the residue-voltage protection circuit.

Vdd

EM78P447N

/RESET

Vdd

33K

10K

40K1N4684

Fig. 14 The Residue Voltage Protection Circuit 1

Vdd

EM78P447N

/RESET

Vdd

40KR2

Fig. 15 The Residue Voltage Protection Circuit 2

Product Specification (V1.1) 03.30.2005

• 29

(This specification is subject to change without further notice)

Page 33

Image 33

IBM manual Residue-Voltage Protection, Vdd EM78P447N RESET, Vdd R1 Q1 40KR2, Vdd 33K, 40K1N4684

Contents

EM78P447N Product Specification8-Bit Microcontroller with OTP ROM ELAN MICROELECTRONICS CORPCopyright 2005 by ELAN Microelectronics Corporation Trademark AcknowledgmentsAll Rights Reserved ELAN MICROELECTRONICS CORPORATIONFEATURES ContentsDC ELECTRICAL CHARACTERISTICS Specification Revision HistoryDC Electrical Characteristic AC Electrical Characteristic2 FEATURES 1 GENERAL DESCRIPTIONEM78P447N EM78P447N Programmable free running watchdog timerThis specification is subject to change without further notice 3 PIN ASSIGNMENTEM78P447N Fig. 1 Pin AssignmentEM78P447N 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 Fig. 2 Functional Block Diagram 4 FUNCTION DESCRIPTIONEM78P447N Table 5 EM78P447NDK and EM78P447NDM Pin Description4.1.1 R0 Indirect Addressing Register 4.1 Operational Registers4.1.2 R1 Time Clock /Counter 4.1.3 R2 Program Counter & StackEM78P447N Reset VectorFig. 3 Program Counter Organization 00 PAGE0 0000~03FFEM78P447N Fig. 4 Data Memory Configuration4.1.6 R5~R7 Port 5 ~ Port7 4.1.5 R4 RAM Select Register4.1.7 R8~R1F and R20~R3E General Purpose Register EM78P447N4.1.8 R3F Interrupt Status Register 4.2 Special Purpose Registers4.2.1 A Accumulator 4.2.2 CONT Control Register4.2.3 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 EM78P447N 4.4 I/O PortsFig. 7 a The I/O Port and I/O Control Register Circuit Fig.7 b The I/O Port with R-Option P70, P71 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 4.7.1 Oscillator Modes 4.7 OscillatorEM78P447N Fig. 9 Interrupt Input CircuitEM78P447N 4.7.2 Crystal Oscillator/Ceramic ResonatorsXTALFig. 10 Crystal/Resonator Circuit Fig. 11 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 EM78P447N4.10 External Power On Reset Circuit 4.9 Power On ConsiderationsRESET 4.8.2 Customer ID Register WordVdd EM78P447N RESET 4.11 Residue-Voltage ProtectionVdd EM78P447N RESET EM78P447NEM78P447N 4.12 Instruction SetINSTRUCTION EM78P447NMNEMONIC OPERATIONThis instruction is applicable to IOC5 ~ IOC7, IOCB, IOCE, IOCF only EM78P447NThis instruction is not recommended for R3F operation This instruction cannot operate under R3FThis specification is subject to change without further notice 4.13 Timing DiagramEM78P447N TEST POINTSDC Electrical Characteristic DC ELECTRICAL CHARACTERISTICS5 ABSOLUTE MAXIMUM RATINGS EM78P447NEM78P447N 8-Bit Microcontroller with OTP ROM AC Electrical CharacteristicEM78P447N 6.3 Device characteristicEM78P447N This specification is subject to change without further noticeFig.18 Port5, Port6 and Port7 Voh vs. Ioh,VDD=5VEM78P447N This specification is subject to change without further noticeVoh/Ioh VDD=3V IohmAEM78P447N This specification is subject to change without further noticeVol/Iol VDD=5V IolmAEM78P447N This specification is subject to change without further noticeVol/Iol VDD=3V IolmAEM78P447N This specification is subject to change without further noticeVol/Iol IolmAEM78P447N This specification is subject to change without further noticeVol/Iol IolmAThis specification is subject to change without further notice WDT TimeoutEM78P447N periodR=3.3k EM78P447NR=5.1k R=10kEM78P447N ICC1：VDD=3V, Fosc=32 kHz, 2clock, WDT disableFig. 29 Typical Operating Current（ICC3 and ICC4） vs. Temperature Fig. 28 Maximum Operating Current（ICC1 and ICC2） vs. TemperatureEM78P447N Max ICC2Temperature Maximum ICC3 and ICC4 vs. TemperatureFig. 30 Maximum Operating Current（ICC3 and ICC4） vs. Temperature Fig. 31 Typical Standby Current（ISB1 and ISB2） vs. TemperatureFig. 33 Operating Voltage In Temperature Range from -40 to Fig. 32 Maximum Standby Current（ISB1 and ISB2） vs. TemperatureEM78P447N Max ISB2EM78P447N This specification is subject to change without further noticeFig. 34 EM78P447N I-V Curve Operating at 4 MHz Fig. 35 EM78P447N I-V Curve Operating at 32.768 kHzB Package Information APPENDIX A Package TypesEM78P447N 20-Lead plastic dual inline package（DIP）－ 300 milEM78P447N This specification is subject to change without further notice24-Lead plastic dual inline skinny package（DIP）－ 300 mil 28-Lead plastic dual inline package（DIP）－ 600 milEM78P447N This specification is subject to change without further notice32-Lead plastic dual inline package（DIP）－ 600 mil 20-Lead plastic small outline package（SOP）－ 300 milEM78P447N This specification is subject to change without further notice24-Lead plastic small outline package（SOP）－ 300 mil 28-Lead plastic small outline package（SOP）－ 300 milEM78P447N This specification is subject to change without further notice32-Lead plastic small outline package（SOP）－ 300 mil 28-Lead Shrink Small Outline Package（SSOP）－ 209 mil