M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 331

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

Timer B
316
Operation
Figure 2.3.4. Operation timing of timer mode
2.3.2 Operation of Timer B (timer mode)
In timer mode, choose functions from those listed in Table 2.3.1. Operations of the circled items are
described below. Figure 2.3.4 shows the operation timing, and Figure 2.3.5 shows the set-up procedure.
Count start flag
Timer Bi interrupt
request bit
(1) Setting the count start flag to “1” causes the counter to perform a down count on the count
(2) If an underflow occurs, the content of the reload register is reloaded, and the counter contin-
(3) Setting the count start flag to “0” causes the counter to hold its value and to stop.
Table 2.3.1. Choosed functions
Count source
source.
ues counting. At this time, the timer Bi interrupt request bit goes to “1”.
FFFF
0000
“1”
“0”
“1”
“0”
Item
16
16
n
n = reload register content
(1) Start count
Set to “1” by software
O
Internal count source (f
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
)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(3) Stop count
Start count
again
Set to “1” by software
Mitsubishi microcomputers
M16C / 62 Group
Time