M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 303

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

Timer A
288
Operation
Note
Figure 2.2.8. Operation timing of timer mode, gate function selected
2.2.3 Operation of Timer A (timer mode, gate function selected)
In timer mode, choose functions from those listed in Table 2.2.2. Operations of the circled items are
described below. Figure 2.2.8 shows the operation timing, and Figure 2.2.9 shows the set-up procedure.
Count start flag
TAi
input signal
Timer Ai interrupt
request bit
IN
pin
Table 2.2.2. Choosed functions
(1) When the count start flag is set to “1” and the TAi
(2) When the TAi
(3) If an underflow occurs, the content of the reload register is reloaded and the count continues.
(4) Setting the count start flag to “0” causes the counter to hold its value and to stop.
• Make the pulse width of the signal input to the TAi
Count source
Gate function
Pulse output function
source.
FFFF
0000
forms a down count on the count source.
At this time, the timer Ai interrupt request bit goes to “1”.
“H”
16
“1”
“0”
“L”
“1”
“0”
16
n
Item
n = reload register content
Set to “1” by software
(1) Start count
IN
pin inputs at “L” level, the counter holds its value and stops.
O
O
O
Internal count source(f
Pulses output
No pulses output
Performs count only for the period in which the TAi
No gate function
Performs count only for the period in which the TAi
(2) Stop count
Cleared to “0” when interrupt request is accepted, or cleared by software
1
/ f
8
/ f
32
/ fc
IN
32
IN
)
pin not less than two cycles of the count
Set-up
(3) Underflow
pin inputs at “H” level, the counter per-
Cleared to “0” by
software
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
IN
IN
pin is at “H” level
pin is at “L” level
(4) Stop count
Set to “1” by software
Mitsubishi microcomputers
M16C / 62 Group
Start count again.
Time