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Chapter 11
16-bit Timer/Event Counter T
User’s Manual U16580EE3V1UD00
(7)
TMTn I/O control register 3 (TTnIOC3)
The TTnIOC3 register is an 8-bit register that controls the valid edge of encoder clear input
(TECRTn pin) and encoder input (TENCTn1 and TENCTn0 pins).
This register can be read and written in 8-bit or 1-bit units.
Reset input clears this register to 00H.
Set the TTnIOC3 register when TTnCE = 0. When TTnCE = 1, write access to the TTnIOC2
register can be performed using the same value.
Figure 11-12:
TMTn I/O Control Register 3 (TTnIOC3) (1/2)
Remark:
n = 0, 1
After reset:
00H
R/W
Address:
TT0IOC3 FFFFF696H,
TT1IOC3 FFFFF6A6H
7
6
5
4
3
2
1
0
TTnIOC3
TTnSCE
TTnZCL
TTnBCL
TTnACL
TTnECS1 TTnECS0 TTnEIS1
TTnEIS0
(n = 0, 1)
TTnSCE
Selects the encoder counter clear method
0
Clear upon detection of edge of TECRTn pin
1
Clear upon match of clear condition level
When TTnSCE = 1, the counter is cleared to 0000H if all the conditions set with bits
TTnZCL, TTnBCL, and TTnACL are matched.
When TTnSCE = 1, the settings of bits TTnECS1 and TTnECS0 are invalid, so no encoder
clear interrupt (INTTTnEC) is output.
When TTnSCE = 0, the settings of bits TTnZCL, TTnBCL, and TTnACL are invalid. The
settings of bits TTnECS1 and TTnECS0 become valid, and the encoder clear interrupt
(INTTTnEC) is output.
Caution:
When TTnSCE = 1, be sure to set bits TTnUDS1, and TTnUDS0 of the
TTnCTL2 register to 10B or 11B.
TTnZCL
Sets the clear level for the Z phase of encoder input (TECRTn pin)
0
Clear condition = Low level
1
Clear condition = High level
Remark:
The TTnZCL bit is valid when TTnSCE = 1.
TTnBCL
Sets the clear level for the B phase of encoder input (TENCTn1 pin)
0
Clear condition = Low level
1
Clear condition = High level
Remark:
The TTnBCL bit is valid when TTnSCE = 1.
TTnACL
Sets the clear level for the A phase of encoder input (TENCTn0 pin)
0
Clear condition = Low level
1
Clear condition = High level
Remark:
The TTnACL bit is valid when TTnSCE = 1.
Содержание V850E/PH2
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