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M16C/6N Group (M16C/6NK, M16C/6NM)
13.1.3 One-shot Timer Mode
In one-shot timer mode, the timer is activated only once by one trigger. When the trigger occurs, the timer
starts up and continues operating for a given period. Table 13.4 lists specifications in one-shot timer
mode. Figure 13.11 shows the TAiMR register in the one-shot timer mode.
Table 13.4 Specifications in One-shot Timer Mode
Item
Count Source
Count Operation
Divide Ratio
Count Start Condition
Count Stop Condition
Interrupt Request Generation Timing When the counter reaches "0000h"
TAiIN Pin Function
TAiOUT Pin Function
Read from Timer
Write to Timer
Select Function
i = 0 to 4
j = i - 1, except j = 4 if i = 0
k = i + 1, except k = 0 if i = 4
Rev.2.00
Nov 28, 2005
REJ09B0124-0200
f1, f2, f8, f32, fC32
• Down-count
• When the counter reaches 0000h, it stops counting after reloading a new value
• If a trigger occurs when counting, the timer reloads a new count and restarts counting
1/n
n : set value of the TAi register
However, the counter does not work if the divide-by-n value is set to 0000h.
The TAiS bit in the TABSR register = 1 (start counting) and one of the following
triggers occurs.
• External trigger input from the TAiIN pin
• Timer B2 overflow or underflow,
Timer Aj overflow or underflow,
Timer Ak overflow or underflow
• The TAiOS bit in the ONSF register is set to "1" (timer starts)
• When the counter is reloaded after reaching "0000h"
• TAiS bit is set to "0" (stop counting)
I/O port or trigger input
I/O port or pulse output
An indeterminate value is read by reading the TAi register
• When not counting and until the 1st count source is input after counting start
Value written to the TAi register is written to both reload register and counter
• When counting (after 1st count source input)
Value written to the TAi register is written to only reload register
(Transferred to counter when reloaded next)
• Pulse output function
The timer outputs a low when not counting and a high when counting.
page 125 of 378
Specification
0000h to FFFFh
13. Timers
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