Rev. 2.0, 11/00, page 291 of 1037
12.2
Descriptions of Respective Registers
12.2.1
Timer Mode Register A (TMA)
0
0
1
0
R/W
2
0
R/W
3
0
4
1
5
—
—
—
—
1
6
0
7
R/W
R/W
R/W
TMAIE
0
R/(W)
*
TMAOV
TMA3
TMA2
TMA1
TMA0
Note:
*
Only 0 can be written to clear the flag.
Bit :
Initial value :
R/W :
The timer mode register A (TMA) works to control the interrupts of the Timer A and to select
the input clock.
TMA is an 8-bit read/write register. When reset, the TMA will be initialized to H'30.
Bit 7: Timer A Overflow Flag (TMAOV)
This is a status flag indicating the fact that the TCA is overflowing (H'FF
→
H'00).
Bit 7
TMAOV
Description
0
[Clearing conditions]
(Initial value)
When 0 is written to the TMAOV flag after reading the TMAOV flag under the status
where TMAOV = 1
1
[Setting conditions]
When the TCA overflows
Bit 6: Enabling Interrupt of the Timer A (TMAIE)
This bit works to permit/prohibit occurrence of interrupt of the Timer A (TMAI) when the TCA
overflows and when the TMAOV of the TMA is set to 1.
Bit 6
TMAIE
Description
0
Prohibits occurrence of interrupt of the Timer A (TMAI)
(Initial value)
1
Permits occurrence of interrupt of the Timer A (TMAI)
Bits 5 and 4: Reserved
When they are read, 1 will always be readout. Writes are disabled.
Содержание Hitachi H8S/2191
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