Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 74

• Manufacturer Part Number: Z90251
• Description: eZVision 200 Television Controllers with OSD
• Manufacturer: ZILOG [Zilog, Inc.]

During the interrupt service routine, software must read the contents of Timer
Control Register 0. Then it checks which bit is set to 1, indicating the type of edge
which generated the interrupt.
Table 51 Timer Control Register 1 02h: Bank C (TCR1)
Bit/
Field
Reserved
CAPint_r
CAPint_f
Tout_CAP
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Reserved
CAP Halt
CAP Edge
Bit
Position
7, 6, 5, 4, 3
2
1
0
Bit
Position
7
6
5, 4
R/W
7
x
R/W
6
1
R/W
W
W
W
W
R
R
R
R
R/W
R/W
R/W
W
R/W
R
5
0
Value Description
0
1
0
1
0
1
0
1
0
1
0
1
32 KB Television Controller with OSD
Value
R/W
00
01
10
11
Return 0
No Effect
No Rising Edge is Captured
Rising Edge is Captured
No Effect
Reset Flag
No Falling Edge is Captured
Falling Edge is Captured
No Effect
Reset Flag
No Time-out of the Capture Timer
Time-out of the Capture Timer
No Effect
Reset Flag
0
1
4
0
Description
Return 0
No Effect
Capture Timer Running
Capture Timer Halted
No capture
Capture on Rising Edge Only
Capture on Falling Edge Only
Capture on Both Edges
R/W
3
0
R/W
2
0
R/W
PS001301-0800
1
0
R/W
0
0
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