M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 324

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

322
(b) Notes on rewriting the TQ0CCR0 register
If the value of the TQ0CCR0 register is rewritten to a smaller value during counting, the 16-bit counter may
overflow. When the overflow may occur, stop counting once and then change the set value.
If the value of the TQ0CCR0 register is changed from D
less than D
has been rewritten. Consequently, the value that is compared with the 16-bit counter is D
Because the count value has already exceeded D
overflows, and then counts up again from 0000H. When the count value matches D
signal is generated.
Therefore, the INTTQ0CC0 signal may not be generated at the valid edge count of “(D
+ 1) times” originally expected, but may be generated at the valid edge count of “(10000H + D
INTTQ0CC0 signal
TQ0CCR0 register
16-bit counter
1
, the count value is transferred to the CCR0 buffer register as soon as the TQ0CCR0 register
TQ0CE bit
FFFFH
0000H
CHAPTER 7 16-BIT TIMER/EVENT COUNTER Q (TMQ)
External event
count (1)
(D
1
User’s Manual U16543EJ4V0UD
)
D
1
D
1
D
External event count (NG)
(10000H + D
2
2
, however, the 16-bit counter counts up to FFFFH,
D
1
1
to D
2
2
+ 1)
while the count value is greater than D
D
2
D
2
External event
count (2)
(D
D
2
+ 1)
2
1
2
, the INTTQ0CC0
+ 1) times” or “(D
2
.
2
+ 1) times”.
2
but
2