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ELANsat Tech EM78P156N OTP ROM, EM78P156N, 4.8CODE Option Register, Vcc, Rext, Cext, Table 11 RC Oscillator Frequencies, Fig. 13 Circuit for External RC Oscillator Mode

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EM78P156N

OTP ROM

VccRext

OSCI

Cext

EM78P156N

Fig. 13 Circuit for External RC Oscillator ModeTable 11 RC Oscillator Frequencies

Cext	Rext	Average Fosc 5V,25°C	Average Fosc 3V,25°C

	3.3k	3.92 MHz	3.65 MHz
20 pF	5.1k	2.67 MHz	2.60 MHz
20 pF	10k	1.39MHz	1.40 MHz
	10k	1.39MHz	1.40 MHz
	100k	149 KHz	156 KHz
	3.3k	1.39 MHz	1.33 MHz
100 pF	5.1k	940 KHz	920 KHz
100 pF	10k	480 KHz	475 KHz
	10k	480 KHz	475 KHz
	100k	52 KHz	50 KHz
	3.3k	595 KHz	560 KHz
300 pF	5.1k	400 KHz	390 KHz
300 pF	10k	200 KHz	200 KHz
	10k	200 KHz	200 KHz
	100k	21 KHz	20 KHz

<Note> 1. Measured on DIP packages.

2.For design reference only.

3.The frequency drift is about ±30%

4.8CODE Option Register

The EM78P156N has a CODE option word that is not a part of the normal program memory. The option bits cannot be accessed during normal program execution.

Code Option Register and Customer ID Register arrangement distribution:

This specification is subject to change without prior notice. 29

07.29.2004 (V1.2)

Contents

8-BIT MICRO-CONTROLLER Version EM78P156N Specification Revision History Version Content Application Note 1. GENERAL DESCRIPTION 2. FEATURES Page 3. PIN ASSIGNMENTS Table 2 EM78P156NAS Pin Description Table 3 EM78P156NKM Pin Description 4. FUNCTION DESCRIPTION 3.R2 (Program Counter) & Stack On-chipProgram Memory Fig. 3 Program Counter Organization Address R PAGE registers IOC PAGE registers CONT IOC5 4. R3 (Status Register) Bit 0 (C) • Bit (DC) (Z) 4.2 Special Purpose Registers 1. A (Accumulator) 2. CONT (Control Register) Bit 3 (PAB) Bit 4 (TE) 3. IOC5 ~ IOC6 (I/O Port Control Register) 4. IOCA (Prescaler Counter Register) 5. IOCB (Pull-downControl Register) Bit 0 (/PD0) Bit 1 (/PD1) Bit 5 (OD5) Bit 6 (OD6) Bit 7 (OD7) 7. IOCD (Pull-highControl Register) Bit 0 (/PH0) 4.3 TCC/WDT & Prescaler 4.4 I/O Ports Fig. 6 The Circuit of I/O Port and I/O Control Register for Port Fig. 7(a) The Circuit of I/O Port and I/O Control Register for P60 (/INT) Fig. 7(b) The Circuit of I/O Port and I/O Control Register for P61~P67 Fig. 7(c) Block Diagram of I/O Port 6 with Input Change Interrupt/Wake-up Table 4 Usage of Port 6 Input Change Wake-up/InterruptFunction (I) (II) Fig. 8 The Circuit of I/O Port with R-option(P50,P51) 4.5RESET and Wake-up 1.RESET Page Table 5 The Summary of the Initialized Values for Registers 2.The Status of RST, T, and P of STATUS Register Table 6 The Values of RST, T and P after RESET Fig. 9 Block Diagram of Controller Reset 4.6 Interrupt 4.7Oscillator 1.Oscillator Modes Table 8 Oscillator Modes Defined by OSC and HLP Table 9 The Summary of Maximum Operating Speeds 2. Crystal Oscillator/Ceramic Resonators (XTAL) Fig. 11 Circuit for External Clock Input Fig. 12 Circuit for Crystal/Resonator Table 10 Capacitor Selection Guide for Crystal Oscillator or Ceramic Resonator 3. External RC Oscillator Mode 4.8CODE Option Register 1. Code Option Register (Word 0) •Bit 12 、11 、10 、9:Not used. Reserved Bit 8 (CLKS) Bit 7(ENWDTB) Bit 6: 4.9Power On Considerations 4.10 External Power On Reset Circuit 4.11 Residue-VoltageProtection Fig. 15 Circuit 1 for the Residue Voltage Protection 4.12 Instruction Set Page Page 4.13 Timing Diagrams AC Test Input/Output Waveform RESET Timing (CLK="0") TCC Input Timing (CLKS="0") 5.ABSOLUTE MAXIMUNM RATINGS EM78P156N 6.ELECTRICAL CHARACTERISTICS 6.2 AC Electrical Characteristic Vih/Vil (Input pins with schmitt inverter) Vth (Input thershold voltage) of I/O pins Voh/Ioh (5V) Vol/Iol (5V) Fig. 21 Port5, Port6 Vol vs. Iol, VDD Vol/Iol (3V) Fig. 22 Port5, Port6 Vol vs. Iol, VDD WDT Time out Cext = 100pF, Typical RC Frequency vs. VDD Typical ICC1 and ICC2 vs. Temperature Maximum ICC1 and ICC2 vs. Temperature Typical ICC3 and ICC4 vs. Temperature Maximum ICC3 and ICC4 vs. Temperature Typical ISB1 and ISB2 vs. Temperature Maximum ISB1 and ISB2 vs. Temperature Page EM78P156N-JHXT EM78P156N-JLXT EM78P156N-GHXT EM78P156N-GLXT APPENDIX Package Information 18-LeadPlastic Small Outline (SOP) — 300 mil 20-LeadPlastic Small Outline (SSOP) — 209 mil Quality Assurance And Reliability Address Trap Detect