ST72734 datasheet(77/144 Pages) STMICROELECTRONICS

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ST72774/ST727754/ST72734

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TIMING MEASUREMENT UNIT (Cont’d)

4.5.4 Register Description

CONTROL STATUS REGISTER (TMUCSR)

Bit 7:2 - Read only

Bit 1:0 - Read/Write

Reset Value: 1111 1100 (FCh)

Bit 7:5 = T2[10:8]

MSB of T2 Counter.

Most Significant Bits of the T2 counter value (see

T2 Counter register description).

Bit 4:2= T1[10:8]

MSB T1 Counter.

Most Significant Bits of the T1 counter value (see

T1 Counter register description).

Bit 1 = H_V

Horizontal or Vertical Measurement.

This bit is set and cleared by software to select the

type of measurement. It cannot be modified while

the START bit = 1 (measurement in progress).

0: Vertical measurement.

1: Horizontal measurement.

Bit 0 = START

Start measurement.

This bit is set by software and cleared by hardware

when the measurements are completed. It can not

be cleared by software.

0: Measurement done.

1: Start measurement.

T1 COUNTER REGISTER (TMUT1CR)

Read Only

Reset Value: 1111 1111 (FFh)

This is an 8-bit register that contains the low part of

the counter value.

When a T1 measurement is finished (rising edge

on AV input), the 11-bit counter value is transferred

to this register and to the T1[10:8] bits in the CSR

T1 is H1 value if the H_V bit = 1.

T1 is V1 value if the H_V bit = 0.

T2 COUNTER REGISTER (TMUT2CR)

Read Only

Reset Value: 1111 1111(FFh)

This is an 8-bit register that contains the low part of

the counter value.

When a T2 measurement is finished (rising edge

on the selected sync signal), the 11-bit counter

value is transferred to this register and to the

T2[10:8] bits in the CSR register.

T2 is H2 value if the H_V bit = 1.

T2 is V2 value if the H_V bit = 0.

T2[10] T2[9] T2[8] T1[10] T1[9] T1[8]

H_V START

T1[7]

T1[0]

T2[7]

T2[0]

ST72734 数据表(PDF) 77 Page - STMicroelectronics

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