Table of Contents
Advertisement
M30245 Group
2.2.2 Operation of Timer A (timer mode)
In timer mode, choose functions from those listed in Table 2.2.1. Operations of the circled items are
described below. Figure 2.2.6 shows the operation timing, and Figure 2.2.7 shows the set-up procedure.
www.DataSheet4U.com
Operation (1) Setting the count start flag to "1" causes the counter to perform a down count on the count
Count start flag
Timer Ai interrupt
request bit
Figure 2.2.6. Operation timing of timer mode
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Table 2.2.1. Choosed functions
Item
Count source
O
Internal count source (f
Pulse output function
O
No pulses output
Pulses output
Gate function
O
No gate function
Performs count only for the period in which the TAi
Performs count only for the period in which the TAi
source.
(2) If an underflow occurs, the content of the reload register is reloaded, and the count continues.
At this time, the timer Ai interrupt request bit goes to "1".
(3) Setting the count start flag to "0" causes the counter to hold its value and to stop.
n = reload register content
FFFF
16
(1) Start count
n
0000
16
Set to "1" by software
"1"
"0"
"1"
"0"
page 12 of 354
/ f
/ f
/ fc
1
8
32
32
(2) Underflow
Cleared to "0" by
software
Cleared to "0" when interrupt request is accepted, or cleared by software
Set-up
)
pin is at "L" level
IN
pin is at "H" level
IN
(3) Stop count
Start count again
Set to "1" by software
2. Timer A
Time
Advertisement
Table of Contents
