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DS80C390 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS80C390 Datasheet(HTML) 8 Page - Dallas Semiconductor |
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8 / 58 page  DS80C390 8 of 58 110199 required the same amount of time: two machine cycles or 24 oscillator cycles. In the DS80C390, the MOVX instruction takes as little as two machine cycles or 8 oscillator cycles but the “MOV direct, direct” uses three machine cycles or 12 oscillator cycles. While both are faster than their original counterparts, they now have different execution times. This is because the device usually uses one instruction cycle for each instruction byte. Examine the timing of each instruction for familiarity with the changes. Note that a machine cycle now requires just 4 clocks, and provides one ALE pulse per cycle. Many instructions require only one cycle, but some require five. Refer to the user’s guide for details and individual instruction timing. SPECIAL FUNCTION REGISTERS Special Function Registers (SFRs) control most special features of the microcontroller. This allows the device to have many new features but use the same instruction set as the 8051. When writing software to use a new feature, an equate statement defines the SFR to an assembler or compiler. This is the only change needed to access the new function. The DS80C390 duplicates the SFRs contained in the standard 80C52. Table 2 shows the register addresses and bit locations. Many are standard 80C52 registers. The user’s guide contains a full description of all SFRs. SPECIAL FUNCTION REGISTER LOCATION Table 2 Register Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADDRESS P4 P4.7 P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 80h SP 81h DPL 82h DPH 83h DPL1 84h DPH1 85h DPS ID1 ID0 TSL - - - - SEL 86h PCON SMOD_0 SMOD0 OFDF OFDE GF1 GF0 STOP IDLE 87h TCON TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 88h TMOD GATE C/ T M1 M0 GATE C/ T M1 M0 89h TL0 8Ah TL1 8Bh TH0 8Ch TH1 8Dh CKCON WD1 WD0 T2M T1M T0M MD2 MD1 MD0 8Eh P1 INT5/P1.7 INT4/P1.6 INT3/P1.5 INT2/P1.4 TXD1/P1.3 RXD1/P1.2 T2EX/P1.1 T2/P1.0 90h EXIF IE5 IE4 IE3 IE2 CKRY RGMD RGSL BGS 91h P4CNT - SBCAN P4CNT.5 P4CNT.4 P4CNT.3 P4CNT.2 P4CNT.1 P4CNT.0 92h DPX 93h DPX1 95h C0RMS0 96h C0RMS1 97h SCON0 SM0/FE_0 SM1_0 SM2_0 REN_0 TB8_0 RB8_0 TI_0 RI_0 98h SBUF0 99h ESP - - - - - - ESP.1 ESP.0 9Bh AP 9Ch ACON - - - - - SA AM1 AM0 9Dh C0TMA0 9Eh C0TMA1 9Fh P2 P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 A0h P5 P5.7 P5.6 P5.5 P5.4 P5.3 P5.2 P5.1 P5.0 A1h P5CNT CAN1BA CAN0BA SP1EC C1_I/O C0_I/O P5CNT.2 P5CNT.1 P5CNT.0 A2h C0C ERIE STIE PDE SIESTA CRST AUTOB ERCS SWINT A3h C0S BSS EC96/128 WKS RXS TXS ER2 ER1 ER0 A4h |
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