ADE3800 datasheet(38/138 Pages) STMICROELECTRONICS

38 / 138 page

ADE3800

38/138

Note:

Timeout and Tolerance use Horizontal and Vertical measurements. These can either be the

Horizontal or Vertical syncs from an Analog input or the local generated Horizontal Enable and/or

Vertical Enable.

Table 17: SMEAS Register Definitions (Sheet 1 of 6)

Addr

Mode

Bits

Rst

Description

SMEAS_ACT_CTRL

0100

R/W

[3]

Free-run enable

R/W

[2]

Freeze results during free run mode. No meaning in one shot

mode.

0*: Do not freeze. New result will be available on the next and

subsequent toggle of the polling bit.

1: Freeze the current results. The polling bit will still toggle

and the block continues to free run; however, results will not

update.

R/W

[1]

Activity detection start.

In one-shot mode setting this bit triggers the start of a

measurement. This bit is reset to zero when the

measurement is complete. No meaning in free run mode.

R/W

[0]

Activity detection mode.

0*: free-run mode

1: one-shot mode

SMEAS_ACT_H_SMPTM_L

SMEAS_ACT_H_SMPTM_U

0101

0102

R/W

[7:0]

Sample period value for clock or HSync activity. Xclks [7:0]

Sample period value for clock or HSync activity. Xclks [15:8]

SMEAS_ACT_V_SMPTM_L

SMEAS_ACT_V_SMPTM_U

0103

0104

R/W

[7:0]

Sample period value for vsync activity. Xclks / 256 [7:0]

Sample period value for vsync activity. Xclks / 256 [15:8]

SMEAS_ACT_H_MINEDGE

0105

R/W

[7:0]

Minimum edge count value for clk or HSync activity.

SMEAS_ACT_V_MINEDGE

0106

R/W

[7:0]

Minimum edge count value for vsync activity.

SMEAS_H_TMOT_L

SMEAS_H_TMOT_U

0107

0108

R/W

[7:0]

Timeout counter value for clk or horizontal measurement.

xclks [7:0]

Timeout counter value for clk or horizontal measurement.

xclks [15:8]

SMEAS_V_TMOT_L

SMEAS_V_TMOT_U

0109

010A

R/W

[7:0]

Timeout counter value for vertical measurement. xclks / 256

[7:0]

Timeout counter value for vertical measurement. xclks / 256

[15:8]

SMEAS_CLEAR

0110

R/W

[1]

clears SMEAS_STATUS_RANGE[7] sticky bit only.

Must be reset by software.

[0]

clears timeouts, measurements.

Must be reset by software.

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