41594B datasheet(300/372 Pages) MICROCHIP

300 / 372 page

PIC12LF1840T48A

DS41594B-page 300

Preliminary

 2011-2012 Microchip Technology Inc.

28.1.2

ADVANCED MODE

Advanced mode allows full configuration of the trans-

mitter by writing to the Configuration register. Writing

and reading from this register is performed via a

two-wire interface formed by CTRL and DATA pins.

Advanced mode is enabled by applying a rising signal

on the CTRL pin while driving DATA low. Upon detec-

tion of this rising edge, the data applied to the DATA pin

is accepted as register configuration information. Data

bits are clocked on subsequent rising edges of the

clock signal. The first bit of serial data selects register

read or write operation. The timing for module Configu-

ration register ‘write’ is shown in Figure 28-3. When

writing, all 13 data bits must be written to the register.

Similarly, the Configuration register may be read using

the timing of Figure 28-4. When reading, all 13 bits of

configuration and all 43 bits of test data must be read.

The contents of the Configuration register are

described in Table 28-2. During the register ‘write’ or

‘read’ phases, the transmitter remains in Sleep mode.

The CTRL pin is sampled after t

START has elapsed. The

CTRL pin should not be allowed to float.

FIGURE 28-3:

CONFIGURATION REGISTER ‘WRITE’

FIGURE 28-4:

CONFIGURATION REGISTER ‘READ’

CTRL

DATA

R/W

D11

ACC D12

D10

CTRL

DATA

R/W

D10

ACC 00

D12 D11

T42 T41

Legend:

Data pin is an output.

Note 1: When reading the Configuration register,

64 clock cycles on CTRL pin must be

issued, shifting out on DATA pin the 13

Configuration bits, plus 43 internal test

bits. Reading only the 13 Configuration

bits is not allowed.

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