Maxim-integrated DS80C390 Uživatelský manuál stáhnout pdf (Strana 8)

DS80C390

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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

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

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 57 58

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