MYSON TECHNOLOGY MTU410 4-Bit Micro-Controller with LCD Driver, 1K Word FEATURES • • • • • • • • • • • • • • • • • • • Very low current dissipation. Wide operating voltage range. Supports both Ag and Li batteries. Powerful instruction set. 4-level subroutine nesting (including interrupt). 4 event driven interrupts, 2 external and 2 internal. ROM size: 1024 x 15 bits. RAM size: 64 x 4 bits. Input ports: 2 ports/ 8 pins (S and M). Output port: 1 port/ 4 pins (P). Pseudo serial output port (P). Input/output ports: 2 ports/ 8 pins (I/OA and I/OB). Control outputs: ALARM, LIGHT. LCD driver outputs (can drive up to 75 LCD segments). Mask option to select 4 LCD drive modes: static, duplex (1/2 duty 1/2 bias, 1/3 duty 1/2 bias or 1/3 duty 1/3 bias). Mask option permits LCD driver output pins to be used for DC output ports; up to 25 pins are available. Segment PLA circuit permits any layout on LCD panel. Built-in clock generator (crystal or RC). Built-in voltage doubler, halver, tripler. GENERAL DESCRIPTION The MTU410 is a single chip 4-bit microcontroller with LCD drivers. It can drive up to 3 common times or 25 segments, i.e. a 75-segment LCD driver. This 4-bit microcontroller contains a 4-bit parallel processing ALU, 1024 x 15-bit program ROM, 64 x 4-bit data RAM, input/output ports, alarm driver, timer, clock generator, crystal and RC oscillator circuit, LCD driver and 79 powerful instructions in a single chip. The HALT instruction can be used to stop all internal operations other than timer, clock generator, crystal/RC oscillator and LCD driver. Very low current dissipation can be easily achieved by combining 4 kinds of interrupt functions and HALT instruction to minimize the operation cycle. This datasheet contains new product information. Myson Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. MTU410 Revision 2.7 04/28/1998 1/10 MYSON TECHNOLOGY MTU410 BLOCK DIAGRAM I/O A1~4 I/O B1~4 P1~4 ALARM LIGHT S1~4 M1~4 SEG1~25 COM 1~3 VSS1~3 LCD DRIVER BIDIRECTION I/O PORT OUTPUT PORT INPUT PORT SEGMENT PLA 4-BIT DATA BUS OSC IN OSC OUT OSCILLATOR 6-BIT PRESET TIMER CUP 1 CUP 2 PREDIVIDER CONTROL CIRCUIT ALU RAM 64 X 4 BITS 10-BIT PROGRAM COUNTER INSTRUCTION DECODER 4-LEVEL STACK PROM 1024 X 15-BIT RESET INT 1.0 PACKAGE & CHIP INFORMATION Chip size Pad open Pad pitch 3245um X 2325um 90um X 90um min. 160um 10 20 30 Pad No. 50 1 60 40 MTU410 Revision 2.6 04/28/1998 2/10 MYSON TECHNOLOGY MTU410 2.0 PIN/PAD ASSIGNMENT Unit : um Pad Name No. 1 VDD 2 GND 3 VSS1 4 VSSO 5 VSS2 6 ALARM 7 LIGHT 8 S4 9 S3 10 IOA1 11 IOA2 12 IOA3 13 IOA4 14 IOB1 15 IOB2 16 IOB3 17 IOB4 18 RESET 19 INT 20 P1 21 P2 22 P3 23 P4 24 M1 25 M2 26 M3 27 M4 28 TESTA 29 CUP1 30 CUP2 31 S2 32 S1 Coordinate X Y 3118 1010 3087 1170 3113 1330 3118 1490 3118 1650 3118 1810 3118 1970 3118 2196 2935 2196 2775 2196 2615 2196 2455 2196 2295 2196 2135 2196 1975 2196 1815 2196 1655 2196 1495 2196 1335 2196 1175 2196 1015 2196 855 2196 695 2196 535 2196 375 2196 215 2196 50 2196 50 1970 50 1810 50 1650 50 1490 50 1330 Pad No. 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Name OSCIN CAP OSCOUT COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 COM3 COM2 VSS3 Coordinate X Y 50 1170 50 1010 50 850 50 690 50 530 50 370 50 210 50 50 210 50 370 50 530 50 690 50 850 50 1010 50 1170 50 1330 50 1490 50 1650 50 1810 50 1970 50 2130 50 2290 50 2450 50 2610 50 2770 50 2930 50 3118 50 3118 210 3118 370 3118 530 3118 690 3118 850 *Note: The substrate must connect to VDD. MTU410 Revision 2.6 04/28/1998 3/10 MYSON TECHNOLOGY MTU410 3.0 PIN DESCRIPTION Name OSCIN OSCOUT CAP S1 - 4 Type I O I I M1 - 4 P1 - 4 IOA1 - 4 IOB1 - 4 INT RESET LIGHT ALARM I O I/O I/O I I O O VDD GND VSS0 VSS1 VSS2 VSS3 CUP1 - 2 COM1 - 3 O O Description Typical 32.768kHz crystal is connected across OSCIN/OSCOUT for Oscillation; R/C oscillation mode also available. Connected to OSCOUT for compensation capacitor. Port for input only with chattering eliminator for CK10 (32ms), CK8 (8ms) & CK6 (2ms). (PLA mask option). Input ports. Output ports. Input/Output ports. After power-on reset, sets as input mode. Input/Output ports. After power-on reset, sets as input mode. External interrupt request control input pin. System reset pin. Output only for outputting signal to drive transistor for light. Output only for outputting 4kHz/2kHz/1kHz modulation signal. Also can be used to output a non-modulation signal. (+)Power supply pin. Power supply pin for logic unit inside LSI. When using Li version, a capacitor must be connected across GND and VDD to prevent the logic unit from malfunctioning. (--)Power supply pin. * For Ag version, apply (--) side to both VSS0 & VSS1. For other than Ag version, apply (--) side to both VSS0 & VSS2. LCD power supply pin. Pins for connecting the voltage step-up (step-down) capacitor. Output pins for LCD panel common plate. The following pin is used in each case. Static COM1 COM2 COM3 Alternating frequency SEG1 - 25 O TESTA * Ο 32Hz* 1/2 duty Ο Ο 32Hz* 1/3 duty Ο Ο Ο 43Hz* * Frequency can be doubled, quadrupled with PLA. Output pins for LCD panel segments. * Also used as output ports with mask option. Test pin (for internal testing only). MTU410 Revision 2.6 04/28/1998 4/10 MYSON TECHNOLOGY MTU410 4.0 ABSOLUTE MAXIMUM RATINGS at Ta = 0 to 70oC, VDD = 0V Name Maximum Supply Voltage Maximum Input Voltage Maximum Output Voltage Maximum Operating Temperature Maximum Storage Temperature Symbol VSS1 VSS2 VSS3 Vin1 Vin2 Vout1 Vout2 Vout3 Topg Range -5.5 to +0.3 -5.5 to +0.3 -8.5 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS3-0.3 to +0.3 0 to +70 Unit V V V V V V V V oC Tstg -25 to +125 oC 5.0 ALLOWABLE OPERATING CONDITIONS at Ta = 0 to 70oC, VDD = 0V Name Symb. VSS1 Supply Voltage VSS2 VSS3 VSS1 Supply Voltage VSS2 VSS3 VSS1 Oscillator Start-Up Supply Voltage VSS2 Input "H" Voltage Vih1 Input "L" Voltage Vil1 Input "H" Voltage Vih2 Input "L" Voltage Vil2 Input "H" Voltage Vih3 Input "L" Voltage Vil3 Input "H" Voltage Vih4 Input "L" Voltage Vil4 Fopg1 Operating Freq. Fopg2 Fopg3 Condition External RC Mode Crystal Mode Min. -5.25 -5.25 -8.0 -5.25 -5.25 -8.0 Crystal Mode Ag Battery Mode Li Battery Mode OSCIN at Ext. RC & Ag Battery Mode OSCIN at Ext. RC & Li Battery Mode Ag Battery Mode Li Battery Mode External RC Mode 0.3 x VSS1 VSS1 0.3 x VSS2 VSS2 0.2 x VSS1 VSS1 0.2 x VSS2 VSS2 32 32 32 Max. -1.7 -3.5 -3.5 -1.2 -2.4 -2.4 -1.35 -2.4 0 0.7 x VSS1 0 0.7 x VSS2 0 0.8 x VSS1 0 0.8 x VSS2 32 100 1000 Unit V V V V V V V V V V V V V V V V KHz KHz KHz MTU410 Revision 2.6 04/28/1998 5/10 MYSON TECHNOLOGY MTU410 6.0 ELECTRICAL CHARACTERISTICS at Ta = 0 to 70oC, VDD = 0V 6.1 Input Resistance at #1 : VSS1 = -1.2V ( Ag ); Name Symb. Rllh1 Rllh2 "L"-Level Hold Tr Rllh3 Rmsd1 Rmsd2 M/S Pull-Down Tr Rmsd3 Rintu1 Rintu2 INT Pull-Up Tr Rintu3 Rintd1 Rintd2 INT Pull-Down Tr Rintd3 Rres1 Rres2 RES Pull-Down R Rres3 #2 : VSS2 = -2.4V ( Li ); #3 : VSS2 = -4V (ExtV). Condition Min. Typ. Max. 10 40 100 Vi = 0.8VSS1, #1 10 40 100 Vi = 0.8VSS2, #2 5 20 50 Vi = 0.8VSS2, #3 200 500 1000 Vi = VDD, #1 200 500 1000 Vi = VDD, #2 100 250 500 Vi = VDD, #3 200 500 1000 Vi = VSS1, #1 200 500 1000 Vi = VSS2, #2 100 250 500 Vi = VSS2, #3 200 500 1000 Vi = VDD, #1 200 500 1000 Vi = VDD, #2 100 250 500 Vi = VDD, #3 5 20 50 Vi = VDD or VSS1, #1 5 20 50 Vi = VDD or VSS2, #2 5 20 50 Vi = VDD or VSS2, #3 Unit Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm Kohm 6.2 DC Output Characteristics at #1 : VSS1 = -1.2V ( Ag ); #2 : VSS2 = -2.4V ( Li ); #3 : VSS2 = -4V (ExtV). Name Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "L" Voltage Symb. Voh1a Voh2a Voh3a Vol1a Vol2a Vol3a Voh1b Voh2b Voh3b Vol1b Vol2b Vol3b Condition Ioh = -200uA, #1 Ioh = -1mA, #2 Ioh = -3mA, #3 Iol = 400uA, #1 Iol = 2mA, #2 Iol = 6mA, #3 Ioh = -100uA, #1 Ioh = -500uA, #2 Ioh = -1.5mA, #3 Iol = 200uA, #1 Iol = 1mA, #2 Iol = 3mA, #3 for Alarm Light P port IOAn IOBn Min. -0.5 -1 -1.5 -1.1 -2.1 -3.5 -0.5 -1 -1.5 -1.1 -2.1 -3.5 Typ. -0.3 -0.6 -1.0 -0.9 -1.8 -3.0 -0.3 -0.6 -1.0 -0.9 -1.8 -3.0 Max. -0.1 -0.3 -0.5 -0.7 -1.4 -2.5 -0.1 -0.3 -0.5 -0.7 -1.4 -2.5 Unit V V V V V V V V V V V V MTU410 Revision 2.6 04/28/1998 6/10 MYSON TECHNOLOGY MTU410 6.3 Segment Driver Output Characteristics at #1 : VSS1 = -1.2V ( Ag ); #2 : VSS2 = -2.4V ( Li ); #3 : VSS2 = -4V (ExtV). Name Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "M" Voltage Output "L" Voltage Output "H" Voltage Output "L" Voltage Output "H" Voltage Output "M" Voltage Output "L" Voltage Output "H" Voltage Output "M1" Voltage Symb. Condition for Min. CMOS Output Mode Voh1c Ioh = -10uA, #1 -0.5 Voh2c Ioh = -50uA, #2 -1 Voh3c Ioh = -200uA, #3 -1.5 SEGn Vol1c -1.1 Iol = 20uA, #1 Vol2c -2.1 Iol = 100uA, #2 Vol3c -3.5 Iol = 400uA, #3 Static Display Mode Voh1d Ioh = -1uA, #1 -0.2 Voh2d Ioh = -1uA, #2 -0.2 Voh3d Ioh = -1uA, #3 -0.2 SEGn Vol1d Iol = 1uA, #1 Vol2d Iol = 1uA, #2 Vol3d Iol = 1uA, #3 Voh1e Ioh = -10uA, #1 -0.2 Voh2e Ioh = -10uA, #2 -0.2 Voh3e Ioh = -10uA, #3 -0.2 COMn Vol1e Iol = 10uA, #1 Vol2e Iol = 10uA, #2 Vol3e Iol = 10uA, #3 Duplex (1/2 Bias, 1/2 Duty) Display Mode Voh12f Ioh = -1uA, #1, #2 -0.2 Voh3f -0.2 Ioh = -1uA, #3 SEGn Vol12f Iol = 1uA, #1, #2 Vol3f Iol = 1uA, #3 Voh12g Ioh = -10uA, #1, #2 -0.2 Voh3g Ioh = -10uA, #3 -0.2 Vom12g Iol/h= +/-10uA, #1, #2 -1.4 COMn Vom3g Iol/h= +/-10uA, #3 -2.2 Vol12g Iol = 10uA, #1 Vol3g Iol = 10uA, #3 1/2 Bias, 1/3 Duty Display Mode Voh12h Ioh = -1uA, #1 ,#2 -0.2 Voh3h Ioh = -1uA, #3 -0.2 SEGn Vol12h Iol = 1uA, #1 ,#2 Vol3h Iol = 1uA, #3 Voh12i Ioh = -10uA, #1, #2 -0.2 Voh3i -0.2 Ioh = -10uA, #3 Vom12i Iol/h= +/-10uA, #1, #2 -1.4 COMn Vom3i Iol/h= +/-10uA, #3 -2.2 Vol12i Iol = 10uA, #1, #2 Vol3i Iol = 10uA, #3 1/3 Bias, 1/3 Duty Display Mode SEGn Voh12j Ioh = -1uA, #1, #2 -0.2 Voh3j -0.2 Ioh = -1uA, #3 -1.4 Vom12j Iol/h= +/-10uA, #1, #2 Typ. Max. Unit -0.3 -0.6 -1.0 -0.9 -1.8 -3.0 -0.1 -0.3 -0.5 -0.7 -1.4 -2.5 V V V V V V -1.0 -2.2 -3.8 -1.0 -2.2 -3.8 -2.2 -3.8 -1.0 -1.8 -2.2 -3.8 V V V V V V V V V V V V V V V V V V V V V V -1.0 -1.8 -2.2 -3.8 V V V V V V V V V V -1.0 V V V -2.2 -3.8 MTU410 Revision 2.6 04/28/1998 7/10 MYSON TECHNOLOGY Output "M2" Voltage Output "L" Voltage Output "H" Voltage Output "M1" Voltage Output "M2" Voltage Output "L" Voltage Vom13j Vom22j Vom23j Vol2j Vol3j Voh2k Voh3k Vom12k Vom13k Vom22k Vom23k Vol2k Vol3k Iol/h= +/-10uA, #1, #2 Iol/h= +/-10uA, #1, #2 Iol/h= +/-10uA, #1, #2 Iol = 1uA, #2 Iol = 1uA, #3 Ioh = -10uA, #2 Ioh = -10uA, #3 Iol/h= +/-10uA, #1, #2 Iol/h= +/-10uA, #3 Iol/h= +/-10uA, #1, #2 Iol/h= +/-10uA, #3 Iol = 10uA, #2 Iol = 10uA, #3 MTU410 -2.2 -2.6 -4.2 COMn -0.2 -0.2 -1.4 -2.2 -2.6 -4.2 -1.8 -2.2 -3.8 -3.4 -5.8 -1.0 -1.8 -2.2 -3.8 -3.4 -5.8 V V V V V V V V V V V V V 6.4 Instruction Table Instruction NOP LCT Y,X OPPS X,D MRA X OPP X OPA X OPB X LCB Y,X LCP Y,X ADC X ADC* X SBC X Machine Code 000 0000 0000 0000 000 00YY YYXX XXXX 000 1110 1DXX XXXX 000 1101 01XX XXXX 000 1110 00XX XXXX 000 0100 01XX XXXX 000 1000 01XX XXXX 000 01YY YYXX XXXX 001 10YY YYXX XXXX 001 0000 00XX XXXX 001 0000 10XX XXXX 001 0001 00XX XXXX (Ly) P1,2,3,4 CF Port(P) Port(A) Port(B) (Ly) abcd,efgh (AC) (AC),(Rx) (AC) SBC* X 001 0001 10XX XXXX (AC),(Rx) ADD ADD* SUB SUB* ADN ADN* AND AND* EOR EOR* OR OR* ADCI ADCI* SBCI SBCI* ADDI ADDI* SUBI X X X X X X X X X X X X Y,D Y,D Y,D Y,D Y,D Y,D Y,D 001 0010 00XX XXXX 001 0010 10XX XXXX 001 0011 00XX XXXX 001 0011 10XX XXXX 001 0100 00XX XXXX 001 0100 10XX XXXX 001 0101 00XX XXXX 001 0101 10XX XXXX 001 0110 00XX XXXX 001 0110 10XX XXXX 001 0111 00XX XXXX 001 0111 10XX XXXX 001 1000 0DDD DYYY 001 1000 1DDD DYYY 001 1001 0DDD DYYY 001 1001 1DDD DYYY 001 1010 0DDD DYYY 001 1010 1DDD DYYY 001 1011 0DDD DYYY (AC) (AC),(Rx) (AC) (AC),(Rx) (AC) (AC),(Rx) (AC) (AC),(Rx) (AC) (AC),(Rx) (AC) (AC),(Rx) (AC) (AC),(Ry) (AC) (AC),(Ry) (AC) (AC),(Ry) (AC) Function No Operation <= (Rx) <= (Rx0,1),D,Pulse <= (Rx3) <= (Rx) <= (Rx) <= (Rx) <= (Rx) <= (Rx),(AC) <= (Rx)+(AC)+(CF) <= (Rx)+(AC)+(CF) <= (Rx)+(AC)B+(CF) <= (Rx)+(AC)B+(CF) <= (Rx)+(AC) <= (Rx)+(AC) <= (Rx)+(AC)B+1 <= (Rx)+(AC)B+1 <= (Rx)+(AC) <= (Rx)+(AC) <= (Rx) AND (AC) <= (Rx) AND (AC) <= (Rx) EOR (AC) <= (Rx) EOR (AC) <= (Rx) OR (AC) <= (Rx) OR (AC) <= (Ry)+(D)+(CF) <= (Ry)+(D)+(CF) <= (Ry)+(D)B+(CF) <= (Ry)+(D)B+(CF) <= (Ry)+(D) <= (Ry)+(D) <= (Ry)+(D)B+1 Remark Flag Y=000- No Use Y=000- No Use Y=000- No Use CF CF CF CF CF CF CF CF CF CF CF CF CF CF CF MTU410 Revision 2.6 04/28/1998 8/10 MYSON TECHNOLOGY Instruction SUBI* Y,D ADNI Y,D ADNI* Y,D ANDI Y,D ANDI* Y,D EORI Y,D EORI* Y,D ORI Y,D ORI* Y,D MRW Y,X MWR X,Y LDS X,D IPS X IPM X IPA X IPA* X IPB X IPB* X MAF X Machine Code 001 1011 1DDD DYYY 001 1100 0DDD DYYY 001 1100 1DDD DYYY 001 1101 0DDD DYYY 001 1101 1DDD DYYY 001 1110 0DDD DYYY 001 1110 1DDD DYYY 001 1111 0DDD DYYY 001 1111 1DDD DYYY 011 100Y YYXX XXXX 011 110Y YYXX XXXX 010 01DD DDXX XXXX 010 0000 00XX XXXX 010 0000 10XX XXXX 010 0001 00XX XXXX 010 0001 01XX XXXX 010 0001 10XX XXXX 010 0001 11XX XXXX 011 0001 00XX XXXX (AC),(Ry) (AC) (AC),(Ry) (AC) (AC),(Ry) (AC) (AC),(Ry) (AC) (AC),(Ry) (AC),(Ry) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) (AC),(Rx) MTU410 Function <= (Ry)+(D)B+1 <= (Ry)+(D) <= (Ry)+(D) <= (Ry) AND (D) <= (Ry) AND (D) <= (Ry) EOR (D) <= (Ry) EOR (D) <= (Ry) OR (D) <= (Ry) OR (D) <= (Rx) <= (Ry) <= (D) <= Port(S) <= Port(M) <= Port(A) <= Port(A) <= Port(B) <= Port(B) <= STS1 MSB X 010 0010 00XX XXXX (AC),(Rx) <= STS2 MSC X 011 0000 00XX XXXX (AC),(Rx) <= STS3 STA SR0 X X 010 0010 10XX XXXX 010 0011 00XX XXXX SR1 X 010 0011 01XX XXXX SL0 X 010 0011 10XX XXXX SL1 X 010 0011 11XX XXXX LDA JB0 JB1 JB2 JB3 JNZ JNC JZ JC JMP CALL X X X X X X X X X X X 011 0111 10XX XXXX 100 00XX XXXX XXXX 100 01XX XXXX XXXX 100 10XX XXXX XXXX 100 11XX XXXX XXXX 101 00XX XXXX XXXX 101 01XX XXXX XXXX 101 10XX XXXX XXXX 101 11XX XXXX XXXX 110 00XX XXXX XXXX 110 01XX XXXX XXXX (Rx) (ACn),(Rxn) (AC3),(Rx3) (ACn),(Rxn) (AC3),(Rx3) (ACn),(Rxn) (AC0),(Rx0) (ACn),(Rxn) (AC0),(Rx0) (AC) (PC) (PC) (PC) (PC) (PC) (PC) (PC) (PC) (PC) (STACK) (PC) (PC) <= (AC) <= (Rxn+1) <= 0 <= (Rxn+1) <= 1 <= (Rxn-1) <= 0 <= (Rxn-1) <= 1 <= (Rx) <= X <= X <= X <= X <= X <= X <= X <= X <= X <= (PC)+1 <= X <= (STACK) RTS 110 1000 0000 0000 Remark Flag CF I/OA <= I/P I/OB <= I/P TF2 : AC=0 TF3 : CF B0 : BCF B1 : SCF1(MPT) B2 : SCF2(HRF) B3 : SCF3(SPT) B0 : SCF4(INT) B1 : SCF5(TMR) B2 : PH15 B3 : SCF7(PDV) if (AC0) = 1 if (AC1) = 1 if (AC2) = 1 if (AC3) = 1 if (AC) ≠ 0 if (CF) = 0 if (AC) = 0 if (CF) = 1 MTU410 Revision 2.6 04/28/1998 9/10 MYSON TECHNOLOGY Instruction SMS X Machine Code 111 0000 000X XXXX TMS SF 111 0010 00XX XXXX 111 0100 0XXX XXXX X X RF X 111 0110 0XXX XXXX ALM X 111 0111 XXXX XXXX SIE X 111 1000 XXXX XXXX SIE* PLC X X 111 1010 0000 XXXX 111 110X XXXX XXXX HALT Function <= X0-3 <= X4 SEF0-3 SEF4 TIMER X6 X5 X3 X2 X1 X0 X6 X5 X2 X1 X0 X7,X6 Signal Xn = 1 Signal Xn = 1 Signal X5-7 X0-3 X0-3 X0-3 X8 MTU410 Remark S1-4 is Enabled M1-4 Enable <= X : M-PORT Pull-Low : S-PORT Pull-Low : HALT After Light : LIGHT ON : BCF Set : CF Set : M-PORT Low-L-H : S-PORT Low-L-H : LIGHT OFF : BCF Reset : CF Reset 0,1 1,0 1,1 DC 1K/2K 4K Hz X5 X4 X3 1 Hz 2 Hz 4 Hz X2 X1 X0 8 Hz 16 Hz 32 Hz : HEF1-3 is Enabled : IEF0-3 is Enabled : IEF0-3 is Enabled : Reset HRF0-3 : Reset PH11-15 Flag SCF3 SCF1 HRF0 HRF1 BCF CF 111 1111 1111 1111 Symbol Description AC ACn Rx Rxn Ry D PC Ly : Accumulator : Accumulator Bit N : Memory of Address X : Memory Bit N of Address X : Memory of Working Register Y : Immediate Data : Program Counter : LCD Latch CF BCF IEFn HEFn HRFn SEFn SCFn : Carry Flag : Backup Flag : Interrupt Enable Flag : HALT Release Enable Flag : HALT Release Flag : Switch Enable Flag : Start Condition Flag MTU410 Revision 2.6 04/28/1998 10/10