FUJITSU F2MC-8L F202RA - Manual (Page 195)

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CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER
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16-bit mode
The values in TDR0 are compared with the counter values in the lower 8 bits of the 16-bit timer.
When the interval timer function is used, the lower 8 bits of the interval time are set. When the counter
function is used, the lower 8 bits of the count value to be detected are set. The values in TDR0 are loaded to
the lower 8 bits of the comparator data latch when matching the counter values of the 16-bit timer or when
the count operation is started. The values written to TDR0 when the 16-bit counter is in operation become
valid after match detection.
For the values set in TDR1 when the interval timer function is used, see Section "8.4.6 Timer 1 Data
Register (TDR1) ".