Timer Mode - Renesas 7700 FAMILY User Manual

TIMER B

6.3 Timer mode

6.3 Timer mode
In this mode, the timer counts an internally generated count source. (Refer to Table 6.3.1.) Figure 6.3.1
shows the structures of the timer Bi mode register and timer Bi register in the timer mode.
Table 6.3.1 Specifications of timer mode
Item
Count source
Count operation
Count start condition
Count stop condition
Interrupt request occurrence timing
TBi pin function
IN
Read from timer Bi register
Write to timer Bi register
6–8
f /f , f /f , f /f , or f
2 4 16 32 64 128
•Down-count
•When the counter underflows, reload register's contents are reloaded
and counting continues.
When count start bit is set to "1."
When count start bit is cleared to "0."
When the counter underflows.
Programmable I/O port
Counter value can be read out.
While counting is stopped
When a value is written to the timer Bi register, it is written to both
reload register and counter.
While counting is in progress
When a value is written to the timer Bi register, it is written to only
reload register. (Transferred to counter at next reload time.)
7751 Group User's Manual
Specifications
/f
512 1024