tmp89ch42 TOSHIBA Semiconductor CORPORATION, tmp89ch42 Datasheet - Page 153
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tmp89ch42
Manufacturer Part Number
tmp89ch42
Description
8 Bit Microcontroller Tlcs-870/c1 Series
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89CH42.pdf
(342 pages)
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RA001
12. Time Base Timer (TBT)
12.1
12.1.1
12.1.2
Time base timer control register
(0x0039)
TBTCR
a time base timer interrupt (INTTBT) in a certain cycle.
The time base timer generates the time base for key scanning, dynamic display and other processes. It also provides
Note 1: fcgck : Gear clock [Hz], fs : Low-frequency clock [Hz]
Note 2: When the operation is changed to the STOP mode, TBTCR<TBTEN> is cleared to "0" and TBTCR<TBTCK> maintains
Note 3: TBTCR<TBTCK> should be set when TBTCR<TBTEN> is "0".
Time Base Timer
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
The time base timer is controlled by the time base timer control register (TBTCR).
Configuration
Control
Read/Write
TBTEN
TBTCK
Bit Symbol
After reset
the value.
22
20
15
13
12
10
11
or fs/2
or fs/2
fcgck/2
or fs/2
or fs/2
or fs/2
or fs/2
or fs/2
15
13
8
6
5
4
3
8
Enables/disables the time base tim-
er interrupt requests
Selects the time base timer interrupt
frequency
Unit: [Hz]
TBTCK
Figure 12-1 Time Base Timer Configuration
R
7
0
-
3
TBTCR
Source clock
R
6
0
-
TBTEN
R
5
0
0: Disables generation of interrupt request signals
1: Enables generation of interrupt request signals
TBTCK
Page 139
Falling edge
-
detector
000
001
010
011
100
101
110
111
R
4
0
-
DV9CK = 0
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
fcgck/2
NORMAL 1/2, IDLE 1/2 mode
22
20
15
13
12
11
10
8
TBTEN
R/W
3
0
DV9CK = 1
Reserved
fs/2
fs/2
fs/2
fs/2
fs/2
fs/2
fs/2
2
0
15
13
8
6
5
4
3
INTTBT
Interrupt request
IDLE0, SLEEP0
Release request
TBTCK
R/W
1
0
SLOW1/2, SLEEP1
TMP89CH42
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
mode
fs/2
fs/2
15
13
0
0
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