Renesas M16C/6NK Hardware Manual page 140

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M16C/6N Group (M16C/6NK, M16C/6NM)
Table 13.3 Specifications in Event Counter Mode (when processing two-phase pulse signal with timers A2, A3 and A4)
Item
Count Source
Count Operation
Divide Ratio
Count Start Condition
Count Stop Condition
Interrupt Request Generation Timing Timer overflow or underflow
TAiIN Pin Function
TAiOUT Pin Function
Read from Timer
Write to Timer
(1)
Select Function
i = 2 to 4
j = 2, 3
k = 3, 4
NOTE:
1. Only timer A3 is selectable. Timer A2 is fixed to normal processing operation, and timer A4 is fixed
to multiply-by-4 processing operation.
Rev.2.00 Nov 28, 2005
REJ09B0124-0200
• Two-phase pulse signals input to TAiIN or TAiOUT pins
• Up-count or down-count can be selected by two-phase pulse signal
• When the timer overflows or underflows, it reloads the reload register
contents and continues counting. When operating in free-running mode,
the timer continues counting without reloading.
1/ (FFFFh - n + 1) for up-count
1/ (n + 1) for down-count
Set the TAiS bit in the TABSR register to "1" (start counting)
Set the TAiS bit to "0" (stop counting)
Two-phase pulse input
Two-phase pulse input
Count value can be read by reading the TAi register
• When not counting and until the 1st count source is input after counting start
Value written to TAi register is written to both reload register and counter
• When counting (after 1st count source input)
Value written to TAi register is written to reload register
(Transferred to counter when reloaded next)
• Normal processing operation (timer A2 and timer A3)
The timer counts up rising edges or counts down falling edges on TAjIN
pin when input signals on TAjOUT pin is "H".
TAjOUT
TAjIN
• Multiply-by-4 processing operation (timer A3 and timer A4)
If the phase relationship is such that TAkIN pin goes "H" when the input
signal on TAkOUT pin is "H", the timer counts up rising and falling edges
on TAkOUT and TAkIN pins. If the phase relationship is such that TAkIN
pin goes "L" when the input signal on TAkOUT pin is "H", the timer counts
down rising and falling edges on TAkOUT and TAkIN pins.
TAkOUT
TAkIN
• Counter initialization by Z-phase input (timer A3)
The timer count value is initialized to "0" by Z-phase input.
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Specification
n : set value of the TAi register 0000h to FFFFh
Up- Up- Up- Down-
count count count count
Count down all edges
Count up all edges
Count up all edges Count down all edges
13. Timers
Down- Down-
count count