m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 31

• 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
Operation
Note
Figure 2.2.16. Operation timing of two-phase pulse signal process in event counter mode, normal mode selected
2.2.7 Operation of timer A (two-phase pulse signal process in event counter mode,
Timer Ai interrupt
request bit
Count start flag
In processing two-phase pulse signals in event counter mode, choose functions from those listed in Table
2.2.6. Operations of the circled items are described below. Figure 2.2.16 shows the operation timing, and
Figure 2.2.17 shows the set-up procedure.
Note 1: First set to “Reload type” operation. Once the first counting pulse has occurred, the timer may be changed to “Free-Run type”.
TAi
normal mode selected)
TAi
Table 2.2.6. Choosed functions
Note: Timer A3 alone can be selected. Timer A2 is solely used for normal processes, and timer A4 is solely used for 4
(1) Setting the count start flag to “1” causes the counter to count effective edges of the count
(2) Even if an underflow occurs, the content of the reload register is not reloaded, but the count
(3) Even if an overflow occurs, the content of the reload register is not reloaded, but the count
• The up count or down count conditions are as follows:
• Set TAi
OUT
FFFF
Count operation type
IN
Two-phase pulses
process (Note)
0000
an up count is performed.
If a falling edge is present at the TAi
a down count is performed.
If a rising edge is present at the TAi
source.
continues. At this time, the timer Ai interrupt request bit goes to “1”.
continues. At this time, the timer Ai interrupt request bit goes to “1”.
“H”
“L”
“H”
“L”
“1”
“0”
“1”
“0”
multiplication processes.
16
16
Item
IN
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(1) Start count
(Note)
pin and TAi
Set to “1” by software
O
O
OUT
4-multiplication processing
Reload type
Free run type
Normal processing
pin's port direction register to “0”.
Cleared to “0” when interrupt request is accepted, or cleared by software
IN
IN
pin when the input signal level to the TAi
pin when the input signal level to the TAi
(2) Underflow
Set-up
(3)
Overflow
Time
OUT
OUT
pin is “H”,
pin is “H”,
2. Timer A