MRF49XA-ISLASHT datasheet(40/102 Pages) MICROCHIP

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MRF49XA

DS70590C-page 40

Preliminary

EQUATION 2-9:

BCSREG: BATTERY THRESHOLD DETECT AND CLOCK OUTPUT VALUE SET

W-1

W-0

CCB<15:8>

bit 15

bit 8

W-0

COFSB<2:0>

LBDVB<3:0>

bit 7

bit 0

Legend:

r = reserved bit

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-8

CCB<15:8>: Command Code bits

The command code bits (11000000b) are serially sent to the microcontroller to identify the bits to be

written in the BCSREG.

bit 7-5

COFSB<2:0>: Clock Output Frequency Set bits

These bits set the output clock frequency which can be used to run an external host microcontroller.

111 = 10 MHz

110 = 5 MHz

101 = 3.33 MHz

100 = 2.5 MHz

011 = 2 MHz

010 = 1.66 MHz

001 = 1.25 MHz

000 = 1 MHz

bit 4

Reserved: Write as ‘0’

bit 3-0

LBDVB<3:0>: Low Battery Detect Value bits

These bits set the decimal value to calculate the battery detect threshold voltage level(1,2).

Note 1:

When the battery level goes down by 50 mV below this value, the LBTD bit (STSREG<10>) is set, indicating

that the battery level is below the programmed threshold. This is useful in monitoring discharge-sensitive

batteries, such as Lithium cells. The low battery detect can be enabled by setting the LBDEN bit

(PMCREG<2>) and can be disabled by clearing the bit.

2: The low battery threshold value is programmable from 2.2V – 3.8V by using Equation 2-9.

Threshold Voltage Value = 2.25 +[0.1 x (LBDVB<3:0>)]

where:

LBDVB<3:0> is the Decimal Value from 0 to 15.

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