Rainbow-electronics DS1248Y Manual do Utilizador descarregar pdf (Página 3)

DS1248Y

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PHANTOM CLOCK

The Phantom Clock information is contained in 8 regis-

ters of 8 bits, each of which is sequentially accessed one

bit at a time after the 64–bit pattern recognition se-

quence has been completed. When updating the Phan-

tom Clock registers, each register must be handled in

groups of 8 bits. Writing and reading individual bits with-

in a register could produce erroneous results. These

read/write registers are defined in Figure 2.

Data contained in the Phantom Clock register is in

binary coded decimal format (BCD). Reading and writ-

ing the registers is always accomplished by stepping

through all 8 registers, starting with bit 0 of register 0 and

ending with bit 7 of register 7.

PHANTOM CLOCK REGISTER DEFINITION Figure 1

76543210

11000101

00111010

10100011

01011100

11000101

00111010

10100011

01011100

BYTE 0

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTE 6

BYTE 7

HEX

VALUE

NOTE:

The pattern recognition in Hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being accidentally dupli-

cated and causing inadvertent entry to the Phantom Clock is less than 1 in 10

. This pattern is sent to the Phantom

Clock LSB to MSB.

1 2 3 4 5 6 7 8 ... 11 12

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