
Rev. 2.0, 11/00, page 76 of 1037
4.2.3
Timer Register A (TMA)
0
0
1
0
R/W
2
0
3
0
4
1
5
—
—
1
6
0
7
R/W
R/W
R/W
R/W
TMA3
R/W
TMA2
R/W
TMAIE
0
R/(W)
*
TMAOV
TMA1
TMA0
Bit :
Initial value :
R/W :
Note:
*
Only 0 can be written, to clear the flag.
The timer register A (TMA) controls timer A interrupts and selects input clock.
Only Bit 3 is explained here. For details of other bits, see section 12.2.1, Timer Mode Register
A.
TMA is a readable/writable register which is initialized to H'30 by a reset.
Bit 3: Clock source, prescaler select (TMA3)
Selects Timer A clock source between PSS and PSW.
Also controls transition operation to the power-down mode. The operation mode to which the
MCU is transited after SLEEP instruction execution is determined by the combination with other
control bits than this bit.
For details, see the description of Clock Select 2 to 0 in section 12.2.1, Timer Mode Register A.
Bit 3
TMA3
Description
0
•
Timer A counts
φ
-based prescaler (PSM) divided clock pulses
•
When a SLEEP instruction is executed in high-speed mode or medium-speed
mode, a transition is made to sleep mode or software standby mode
(Initial value)
1
•
Timer A counts
φ
w-based prescaler (PSM) divided clock pulses
•
When a SLEEP instruction is executed in high-speed mode or medium-speed
mode, a transition is made to sleep mode, watch mode, or subactive mode
•
When a SLEEP instruction is executed in subactive mode, a transition is made
to subsleep mode, watch mode, or high-speed mode
Содержание Hitachi H8S/2191
Страница 123: ...Rev 2 0 11 00 page 96 of 1037...
Страница 149: ...Rev 2 0 11 00 page 122 of 1037...
Страница 197: ...Rev 2 0 11 00 page 170 of 1037...
Страница 247: ...Rev 2 0 11 00 page 220 of 1037...
Страница 249: ...Rev 2 0 11 00 page 222 of 1037...
Страница 347: ...Rev 2 0 11 00 page 320 of 1037...
Страница 357: ...Rev 2 0 11 00 page 330 of 1037...
Страница 417: ...Rev 2 0 11 00 page 390 of 1037...
Страница 431: ...Rev 2 0 11 00 page 404 of 1037...
Страница 439: ...Rev 2 0 11 00 page 412 of 1037...
Страница 457: ...Rev 2 0 11 00 page 430 of 1037...
Страница 525: ...Rev 2 0 11 00 page 498 of 1037...
Страница 543: ...Rev 2 0 11 00 page 516 of 1037...
Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
Страница 845: ...Rev 2 0 11 00 page 818 of 1037...