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13. 16-bit Timer Counter (TCA)
13.4 Timer Function
TMP89FM42
RA001
13.4 Timer Function
Timer counter A0 has six types of operation modes; timer, external trigger timer, event counter, window, pulse
width measurement and programmable pulse generate (PPG) output modes.
13.4.1 Timer mode
In the timer mode, the up-counter counts up using the internal clock, and interrupts can be generated regu-
larly at specified times.
13.4.1.1 Setting
Setting the operation mode selection TA0MOD<TA0M> to "000" or "001" activates the timer mode.
Select the source clock at TA0MOD<TA0CK>.
Setting TA0CR<TA0S> to "1" starts the timer operation. After the timer is started, writing to TA0MOD
and TA0CR<TA0OVE> becomes invalid. Be sure to complete the required mode settings before starting
the timer.
13.4.1.2 Operation
Setting TA0CR<TA0S> to "1" allows the 16-bit up counter to increment based on the selected internal
source clock. When a match between the up-counter value and the value set to timer register A
(TA0DRA) is detected, an INTTA0 interrupt request is generated and the up counter is cleared to
"0000H". After being cleared, the up counter continues counting. Setting TA0CR<TA0S> to "0" during
the timer operation causes the up counter to stop counting and be cleared to "0000H".
13.4.1.3 Auto capture
The latest contents of the up counter can be taken into timer register B (TA0DRB) by setting
TA0CR<TA0ACAP> to "1" (auto capture function). When TA0CR<TA0ACAP> is "1", the current con-
tents of the up counter can be read by reading TA0DRBL. TA0DRBH is loaded at the same time as
TA0DRBL is read. Therefore, when reading the captured value, be sure to read TA0DRBL and
TA0DRBH in this order. (The capture time is the timing when TA0DRBL is read.) The auto capture func-
tion can be used whether the timer is operating or stopped. When the timer is stopped, TA0DRBL is read
as "00H". TA0DRBH keeps the captured value after the timer stops, but it is cleared to "00H" when
TA0DRBL is read while the timer is stopped.
If the timer is started with TA0CR<TA0ACAP> written to "1", the auto capture is enabled immediately
after the timer is started.
Note 1: The value set to TA0CR<TA0ACAP> cannot be changed at the same time as TA0CR<TA0S> is
rewritten from "1" to "0". (This setting is invalid.)
Table 13-3 Timer Mode Resolution and Maximum Time Setting
TA0MOD
<TA0CK>
Source clock [Hz]
Resolution
Maximum time setting
NORMAL 1/2 or IDLE 1/2 mode
SLOW1/2 or
SLEEP1 mode
fcgck=10MHz
fs=32.768KHz
fcgck=10MHz
fs=32.768KHz
SYSCR1<DV9CK>
= "0"
SYSCR1<DV9CK>
= "1"
00
fcgck/2
10
fs/2
3
fs/2
3
102.4
µ
s
244.1us
6.7s
16s
01
fcgck/2
6
fcgck/2
6
-
6.4
µ
s
-
419.4ms
-
10
fcgck/2
2
fcgck/2
2
-
400ns
-
26.2ms
-
11
fcgck/2
fcgck/2
-
200ns
-
13.1ms
-
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......