m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 21

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

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