Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Manual de usuario descargar pdf (Pagina 54)

MAXQ Family User’s Guide:

MAXQ2000 Supplement

ADDENDUM TO SECTION 13: 1-Wire BUS MASTER

The MAXQ2000 provides a 1-Wire Bus Master (68-pin package only) that operates as described in the MAXQ Family User’s Guide.

Tables 20 to 23 show the associated pins and registers for this interface.

PIN NUMBER

1-WIRE MASTER FUNCTION

68-PIN 56-PIN

MULTIPLEXED WITH PORT PIN

1-Wire Master Input—OW_IN 46 — P6.3

1-Wire Master Output—OW_OUT 47 — P6.4

Table 20. 1-Wire Master Input and Output Pins

OWA M3[13h]

1-Wire Address Register. Selects the 1-Wire register that will be accessible through OWD.

OWD M3[14h]

1-Wire Data Register. Reading and writing to this register reads and writes to the 1-Wire register, which has

been selected by OWA.

Table 21. 1-Wire Interface Control Registers

OWA[2:0]

R/W BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

000

OWCMD

R/W — — — — OW_IN FOW SRA 1WR

001 OWBUF R/W Input/Output Buffer (8 Bits)

010 OWIF R LOW SHORT RSRF RBF TEMT* TBE* PDR PD

011 OWIE R/W EOWL EOWSH ERSF ERBF ETMT ETBE — EPD

100 OWCLK R/W CLK_EN — — DIV2 DIV1 DIV0 PRE1 PRE0

101 OWCTL R/W EOWMI — BIT_CTL — —

EN_FOW

PPM LLM

110

reserved

111

reserved

Table 22. 1-Wire Master Register Bit Functions

OWA[2:0]

R/W BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

000

OWCMD

R/W 0 0 0 0 special 0 0 0

001 OWBUF R/W 0 0 0 0 0 0 0 0

010 OWIF R 0 0001110

011 OWIE R/W 0 0000000

100 OWCLK R/W 0 0 0 0 0 0 0 0

101 OWCTL R/W 0 0 0 0 0 0 0 0

110

reserved

111

reserved

Table 23. 1-Wire Master Register Bit Reset Values

*The behavior of these bits on the MAXQ2000 may differ from their described behavior in the MAXQ Family User's Guide for some device revisions. Refer to

the MAXQ2000 errata for more details (www.maxim-ic.com/errata).

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