Read Timer High Register (Value_Tim_Hi) - Texas Instruments OMAP5910 Technical Reference Manual

Timers
Table 8–8. Read Timer High Register (VALUE_TIM_HI)
Bit Name
15–0 VALUE_TIM_HI
Table 8–9. Read Timer Low Register (VALUE_TIM_LO)
Bit Name
15–0 VALUE_TIM_LO
8-8
Description
Value of timer. This is the same as READ_TIM[31:16],
Description
Value of timer. This is the same as READ_TIM[15:0] at the time
of the last TIPB read to READ_TIM_HI.
The following sequence must be followed to read the READ_TIM register
properly:
1) Perform a TIPB read transaction to read the upper 16 bits of the read timer
register (READ_TIM) (offset = 8). When the read timer register
(READ_TIM) is read and synchronized, the upper 16 bits are driven onto
the data bus of the TIPB and the lower 16 bits of the read timer register
(READ_TIM) are stored in a temporary register.
2) Perform a TIPB read transaction to read the lower 16 bits of the read timer
register (READ_TIM) (offset = 10). During this read, the value of the tem-
porary register is forwarded onto the TIPB bus instead of reading the read
timer register (READ_TIM) again. This is done because the TIMER can
change value between the two TIPB read transactions.
Therefore, to read the value of the read timer register (READ_TIM) correctly,
the first TIPB read access must be to the upper 16 bits (that is, offset = 8),
followed by TIPB read access to the lower 16 bits (that is, offset = 10 (decimal)).
Note:
If the DSP is ready to read the read timer register (READ_TIM), it can send
a 32-bit read request (with offset address of 08) to the DSPI. The DSPI can
convert this 32-bit request into two 16-bit TIPB writes on the DSP TIPB, thus
resolving all the above sequencing issues.
Reset
Value
Undefined
Reset
Value
Undefined