HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 603
HD6417641
Manufacturer Part Number
HD6417641
Description
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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Note: Write 0 after reading TGFA=1 only when a DMA address error occurs during a DMA read
18.3.6
The TCNT registers are 16-bit readable/writable counters. The MTU has five TCNT counters, one
for each channel.
The TCNT counters are initialized to H'0000 by a power-on reset and in standby mode.
The TCNT counters cannot be accessed in 8-bit units; they must always be accessed as a 16-bit
unit.
18.3.7
The TGR registers are dual function 16-bit readable/writable registers, functioning as either output
compare or input capture registers. The MTU has 16 TGR registers, four each for channels 0, 3,
and 4 and two each for channels 1 and 2. TGRC and TGRD for channels 0, 3, and 4 can also be
designated for operation as buffer registers. The TGR registers cannot be accessed in 8-bit units;
they must always be accessed in 16-bit units. TGR buffer register combinations are TGRA to
TGRC and TGRB to TGRD.
Bit
0
cycle.
Timer Counter (TCNT)
Timer General Register (TGR)
Bit Name
TGFA
Initial
value
0
R/W
R/(W) Input Capture/Output Compare Flag A
Description
Status flag that indicates the occurrence of TGRA input
capture or compare match. Only 0 can be written, for
flag clearing.
[Setting conditions]
•
•
[Clearing condition]
•
For DMA, 0 must not be written to after reading
TGFA = 1. This flag is cleared only by hardware.*
When TCNT = TGRA and TGRA is functioning as
output compare register
When TCNT value is transferred to TGRA by input
capture signal and TGRA is functioning as input
capture register
When 0 is written to TGFA after reading TGFA = 1
Section 18 Multi-Function Timer Pulse Unit (MTU)
Rev. 4.00 Sep. 14, 2005 Page 553 of 982
REJ09B0023-0400
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