Rev. 1.00, 09/03, page 411 of 704
14.7 Usage
Notes
14.7.1
Conflict between TWCNT Write and Increment
If a TWCNT increment pulse is generated during the T
2
state of a TWCNT write cycle as shown in
figure 14.10, the write takes priority and TWCNT is not incremented.
Counter input clock
Internal write signal
TWCNT
TWCNT address
TWCNT write cycle by CPU
T
1
T
2
N
M
Counter write data
Address
Figure 14.10 TWCNT Write-Increment Conflict
14.7.2
Write to START Bit during Free-Running Counter Operation
If 1 is written to the START bit in TWCR2 while the FRC bit in TWCR1 is 1 as shown in figure
14.11, duty measurement is ignored and the START bit is cleared to 0.
START bit
START bit
clear signal
TWCR2
write signal
FRC bit
Figure 14.11 Write to START Bit during Free-Running Counter Operation
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