Maxim Integrated MAXQ Family Users Guide: MAXQ2000 Supplement - Manual (Page 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
REGISTER ADDRESS FUNCTION
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] REGISTER 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] REGISTER 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 0 0 0 1 1 1 0
011 OWIE R/W 0 0 0 0 0 0 0 0
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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