m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 16

• 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
(3) Frequency division ratio
(4) Reading the timer
(5) Writing to the timer
(6) Relation between the input/output to/from the timer and the direction register
(7) Pins related to timer A
(8) Registers related to timer A
In timer mode or pulse width modulation mode, [the value set in the timer register + 1] becomes the
frequency division ratio. In event counter mode, [the set value + 1] becomes the frequency division
ratio when a down count is performed, or [FFFF
ratio when an up count is performed. In one-shot timer mode, the value set in the timer register be-
comes the frequency division ratio.
The counter overflows (or underflows) when a count source equal to a frequency division ratio is input,
and an interrupt occurs. For the pulse output function, the output from the port varies (the value in the
port register does not vary).
Either in timer mode or in event counter mode, reading the timer register takes out the count at that
moment. Read it in 16-bit units. The data either in one-shot timer mode or in pulse width modulation
mode is indeterminate.
To write to the timer register when a count is in progress, the value is written only to the reload register.
When writing to the timer register when a count is stopped, the value is written both to the reload
register and to the counter. Write a value in 16-bit units.
With the output function of the timer, pulses are output regardless of the contents of the port direction
register. To input an external signal to the timer, set the port direction register to input.
(a) TA0
(b) TA0
Figure 2.2.1 shows the memory map of timer A-related registers. Figures 2.2.2 through 2.2.5 show
timer A-related registers.
OUT
IN
, TA1
, TA1
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IN
OUT
, TA2
, TA2
IN
, TA3
OUT
, TA3
IN
, TA4
OUT
, TA4
IN
OUT
16
Input pins to timer A.
Output pins from timer A. They become input pins to
timer A when event counter mode is active.
- the set value + 1] becomes the frequency division
2. Timer A