401
12.2.4
Timer Constant Registers (TCOR)
The TMU has three TCOR registers, one for each channel. TCOR specifies the value for setting in
TCNT when a TCNT count-down results in an under flow.
TCOR is a 32-bit readable/writable register. TCOR is initialized to H'FFFFFFFF by a power-on
reset or manual reset, but is not initialized, and retains its contents, in standby mode.
Bit:
31
30
29
28
27
26
25
24
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
23
22
21
20
19
18
17
16
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
15
14
13
12
11
10
9
8
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
Initial value:
1
1
1
1
1
1
1
1
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
12.2.5
Timer Counters (TCNT)
The timer counters are 32-bit readable/writable registers. The TMU has three timer counters, one
for each channel.
TCNT counts down upon input of a clock. The clock input is selected using the TPSC2
–
TPSC0
bits in the timer control register (TCR).
When a TCNT count-down results in an underflow (H'00000000
→
H'FFFFFFFF), the underflow
flag (UNF) in the timer control register (TCR) of the relevant channel is set. The TCOR value is
simultaneously set in TCNT itself and the count-down continues from that value.
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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