Fujitsu MB90460 Series, Руководство по оборудованию, Страница: 325 / 739

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CHAPTER 14 MULTI-FUNCTIONAL TIMER
14.4.7 Input Capture Control Status Registers (ICS23, PICS01)
Input capture control status registers (ICS23, PICS01) are used to control edge
selection, interrupt request enable, interrupt request flag and to indicate valid edge
detected for input capture 0 to 3.
■
Input Capture Control Status Register, Upper Byte (ICSH23)
Figure 14.4-15 Input Capture Control Status Register (ICSH23)
Address bit15 14 13 12 11 10 9 8 Initial value
00006B
H
IEI3 IEI2 ------00
B
R R
IEI2 Valid edge indication bit (input capture 2)
0 Falling edge detected
1 Rising edge detected
IEI3 Valid edge indication bit (input capture 3)
0 Falling edge detected
1 Rising edge detected
R : Read-only
- : Not used
: Initial value
Table 14.4-5 Input Capture Control Status Register (ICSH23)
Bit name Function
bit15
to
bit10
Unused bit
•
The read value is indeterminate.
•
Writing to this bit has no effect on the operation.
bit9
IEI3:
Valid edge
indication bit
•
This bit is an valid edge indication bit for capture register 3, to indicate a rising or falling edge
is detected.
•
“0” is written to this bit when falling edge is detected.
•
“1” is written to this bit when rising edge is detected.
•
This bit is read-only.
(Note)
The read value is meaningless when EG31, EG30 = 00.
bit8
IEI2:
Valid edge
indication bit
•
This bit is an valid edge indication bit for capture register 2, to indicate a rising or falling
edge is detected.
•
“0” is written to this bit when falling edge is detected.
•
“1” is written to this bit when rising edge is detected.
•
This bit is read-only.
(Note)
The read value is meaningless when EG21, EG20 = 00.