CHAPTER 7 TIMER/COUNTER FUNCTION
User’s Manual U13850EJ6V0UD
203
(2) 16-bit capture/compare registers n0 (CR00, CR10)
CRn0 is a 16-bit register that functions as a capture register and as a compare register. Whether this register
functions as a capture or compare register is specified by using the CRCn0 bit of the CRCn register.
(a) When using CRn0 as compare register
The value set to CRn0 is always compared with the count value of the TMn register. When the values of the
two match, an interrupt request (INTTMn0) is generated. When TMn is used as an interval timer, CRn0 can
also be used as a register that holds the interval time.
(b) When using CRn0 as capture register
The valid edge of the TIn0 or TIn1 pin can be selected as a capture trigger. The valid edge of TIn0 or TIn1 is
set by using the PRMn0 register.
When the valid edge of the TIn0 pin is specified as the capture trigger, refer to
Table 7-2.
When the valid
edge of the TIn1 pin is specified as the capture trigger, refer to
Table 7-3.
Table 7-2. Valid Edge of TIn0 Pin and Capture Trigger of CRn0
ESn01
ESn00
Valid Edge of TIn0 Pin
CRn0 Capture Trigger
0
0
Falling edge
Rising edge
0
1
Rising edge
Falling edge
1
0
Setting prohibited
Setting prohibited
1
1
Both rising and falling edges
No capture operation
Remark
n = 0, 1
Table 7-3. Valid Edge of TIn1 Pin and Capture Trigger of CRn0
ESn11
ESn10
Valid Edge of TIn1 Pin
CRn0 Capture Trigger
0
0
Falling edge
Falling edge
0
1
Rising edge
Rising edge
1
0
Setting prohibited
Setting prohibited
1
1
Both rising and falling edges
Both rising and falling edges
Remark
n = 0, 1
CRn0 is set by using a 16-bit memory manipulation instruction. These registers can only be read by a 16-bit
memory manipulation instruction when used as capture registers.
RESET input clears CRn0 to 0000H.
Caution
Set CRn0 to a value other than 0000H in the clear & start mode entered upon a match between
TMn and CRn0. In the free-running mode or the clear & start mode entered upon the TIn0 valid
edge, however, an interrupt request (INTTMn0) is generated after an overflow (FFFFH) when
CRn0 is set to 0000H.
Содержание V850/SB1
Страница 2: ...User s Manual U13850EJ6V0UD 2 MEMO ...