m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 44

• 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
Figure 2.2.29. Reading timer Ai register
Figure 2.2.30. Standard of 2-phase pulses
2.2.13 Precautions for Timer A (event counter mode)
Counter value
(Hex.)
Read value
(Hex.)
(1) Down count
TA2
TA3
TA4
TA2
TA3
TA4
(1) To clear reset, the count start flag is set to “0”. Set a value in the timer Ai register, then set the
(2) Reading the timer Ai register while a count is in progress allows reading, with arbitrary timing,
(3) Please note the standards for the differences between the 2 pulses used in the two-phase
(4) When free run type is selected, if count is stopped, set a value in the timer Ai register again.
n = reload register content
OUT
OUT
OUT
IN
IN
IN
flag to “1”.
the value of the counter. Reading the timer Ai register with the reload timing shown in Figure
2.2.29 gets “FFFF
setting a value in the timer Ai register with a count halted but before the counter starts count-
ing gets a proper value.
pulse signals input signals to the TAi
2.2.30.
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2
2
T2
1
1
T3
16
0
0
T1
” by underflow or “0000
Reload
FFFF
n
Time
n – 1
n – 1
IN
pin and TAi
Read value
(Hex.)
Counter value
(Hex.)
(2) Up count
16
” by overflow. Reading the timer Ai register after
n = reload register content
OUT
Vcc = 5V, f(X
Vcc = 3V, f(X
pin (i = 2, 3, 4), as shown in Figure
FFFD FFFE FFFF
FFFD FFFE FFFF 0000 n + 1
800ns
(Min.)
(Min.)
2µs
T1
T1
IN
IN
) = 20MHz
) = 10MHz
T2, T3
200ns
T2, T3
500ns
(Min.)
(Min.)
Reload
n
Time
n + 1
2. Timer A