TIMER B
8.3 Timer mode
8.3.1 Setting for timer mode
Figure 8.3.2 shows an initial setting example for registers relevant to the timer mode.
Note that when using interrupts, set up registers to enable the interrupts. For details, refer to “CHAPTER
6. INTERRUPTS.”
Selecting timer mode and count source
b7
b0
Timer Bi mode register (i = 0 to 2)
ꢀ ꢀ ꢀ ꢀ 0 0
(Addresses 5B16 to 5D16
)
Selection of timer mode
s
Count source select bit
b7 b6
0 0 : f
2
0 1 : f16
1 0 : f64
1 1 : f512
ꢀ: It may be either “0” or “1.”
Setting division ratio
(b15)
b7
(b8)
b0 b7
b0
Timer B0 register (Addresses 5116, 5016
Timer B1 register (Addresses 5316, 5216
Timer B2 register (Addresses 5516, 5416
)
)
)
Can be set to “000016” to “FFFF16” (n).
Note: The counter divides the count source by (n + 1).
Setting interrupt priority level
b7
b0
Timer Bi interrupt control register (i = 0 to 2)
(Addresses 7A16 to 7C16
)
Interrupt priority level select bits
When using interrupts, set these bits to one of levels 1 to 7.
When disabling interrupts, set these bits to level 0.
Setting count start bit to “1”
b7
b0
Count start register 0 (Address 4016
)
Timer B0 count start bit
Timer B1 count start bit
Timer B2 count start bit
Count starts.
Fig. 8.3.2 Initial setting example for registers relevant to timer mode
7906 Group User’s Manual Rev.2.0
8-10
RENESAS [ RENESAS TECHNOLOGY CORP ]
