DS80C390 Datasheet, PDF(8/58 Page) Dallas Semiconductor – Dual CAN High-Speed Microprocessor

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DS80C390 Datasheet, PDF (8/58 Pages) Dallas Semiconductor – Dual CAN High-Speed Microprocessor

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DS80C390

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 âMOV direct,

directâ 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 userâs 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

userâs guide contains a full description of all SFRs.

SPECIAL FUNCTION REGISTER LOCATION Table 2

P4.7

P4.6

P4.5

P4.4

P4.3

P4.2

P4.1

DPL

DPH

DPL1

DPH1

DPS

ID1

ID0

TSL

PCON SMOD_0 SMOD0 OFDF OFDE GF1

GF0

STOP

TCON

TF1

TR1

TF0

TR0

IE1

IT1

IE0

TMOD

GATE

C/ T

GATE C/ T

TL0

TL1

TH0

TH1

CKCON WD1

WD0

T2M

T1M

T0M

MD2

MD1

INT5/P1.7 INT4/P1.6 INT3/P1.5 INT2/P1.4 TXD1/P1.3 RXD1/P1.2 T2EX/P1.1

EXIF

IE5

IE4

IE3

IE2

CKRY RGMD RGSL

P4CNT

SBCAN P4CNT.5 P4CNT.4 P4CNT.3 P4CNT.2 P4CNT.1

DPX

DPX1

C0RMS0

C0RMS1

SCON0 SM0/FE_0 SM1_0 SM2_0 REN_0 TB8_0 RB8_0 TI_0

SBUF0

ESP

ESP.1

ACON

AM1

C0TMA0

C0TMA1

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P5.7

P5.6

P5.5

P5.4

P5.3

P5.2

P5.1

P5CNT CAN1BA CAN0BA SP1EC C1_I/O C0_I/O P5CNT.2 P5CNT.1

C0C

ERIE

STIE

PDE SIESTA CRST AUTOB ERCS

C0S

BSS EC96/128 WKS

RXS

TXS

ER2

ER1

Bit0

P4.0

SEL

IDLE

IT0

MD0

T2/P1.0

BGS

P4CNT.0

RI_0

ESP.0

AM0

P2.0

P5.0

P5CNT.0

SWINT

ER0

ADDRESS

80h

81h

82h

83h

84h

85h

86h

87h

88h

89h

8Ah

8Bh

8Ch

8Dh

8Eh

90h

91h

92h

93h

95h

96h

97h

98h

99h

9Bh

9Ch

9Dh

9Eh

9Fh

A0h

A1h

A2h

A3h

A4h

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