CMX983 datasheet(71/93 Pages) CMLMICRO

71 / 93 page

Analogue Front End (AFE) for Digital Radio

CMX983

 2015 CML Microsystems Plc

D/983/6

AUXCMP_STAT - $7B: 8-bit Read

Reset value = $00

Bit:

Cmp

thresh

flag 4

Cmp

thresh

flag 3

Cmp

thresh

flag 2

Cmp

thresh

flag 1

Cmp

thresh

flag 0

AUXCMP_STAT Register b7-5: Reserved, set to 0

AUXCMP_STAT Register b4-0: Comparator threshold flag 4..0

Each comparator threshold flag gets set to 1 if the associated comparator is enabled and the

corresponding input pin voltage is greater than the programmed threshold voltage (or less than, if the

comparator output is inverted). The threshold flags in AUXCMP_STAT are sticky: once they are set to

1 they remain in that state until a C-BUS read of AUXCMP_STAT is performed, after which they are

automatically cleared to 0. When AUXCMP_STAT is read, if the comparator input is still greater than

the programmed threshold voltage then the flag will stay high. Disabling a comparator channel does

not automatically clear the associated flag bit.

The five threshold flags in the AUXCMP_STAT register are gated with the enable bits in the

AUXCMP_STAT_EN register and are then ORed together. The resulting analogue comparator status

bit is passed to the CMX983 STATUS register (section 6.4), as shown in Figure 27. This can be used

to generate an interrupt signal.

Figure 27 Comparator and Threshold Status Flag

AUXCMP_ST_EN - $7C: 8-bit Write

Reset value = $00

Bit:

Enab

stat 4

Enab

stat 3

Enab

stat 2

Enab

stat 1

Enab

stat 0

AUXCMP_ST_EN Register b7-5: Reserved, set to 0

AUXCMP_ST_EN Register b4-0: Enable status 4..0

Setting any of the enable status bits to 1 allows the associated comparator threshold flag in the

AUXCMP_STAT register to drive the analogue comparator status bit to 1.

AUXCMP_CON0

bit 7 (Enab cmp)

AUXCMP_CON0

bit 6 (Invert cmp)

AUXCMP_ST_EN

bit 0 (Enab stat 0)

Read

AUXCMP_STAT

bit 0

Analogue

comparator

status

[Comparator / latch

channel 0 shown]

From channels 1...4

set

rst

CLK

CMX983 Datasheet(PDF) 71 Page - CML Microcircuits

CMX983 Datasheet(HTML) 71 Page - CML Microcircuits

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Datasheet Download

Link URL