参数资料
型号: ST62T08CB1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP20
封装: 0.300 INCH, PLASTIC, DIP-20
文件页数: 48/104页
文件大小: 1487K
代理商: ST62T08CB1
ST6208C/ST6209C/ST6210C/ST6220C
48/104
8-BIT TIMER (Cont’d)
8.2.4 Functional Description
There are three operating modes, which are se-
lected by the TOUT and DOUT bits (see TSCR
register). These three modes correspond to the
two clocks which can be connected to the 7-bit
prescaler (fINT ÷ 12 or TIMER pin signal), and to
the output mode.
The settings for the different operating modes are
summarized Table 13.
Table 13. Timer Operating Modes
8.2.4.1 Gated Mode
(TOUT = “0”, DOUT = “1”)
In this mode, the prescaler is decremented by the
Timer clock input, but only when the signal on the
TIMER pin is held high (fINT/12 gated by TIMER
pin). See Figure 28 and Figure 29.
This mode is selected by clearing the TOUT bit in
the TSCR register (i.e. as input) and setting the
DOUT bit.
Note: In this mode, if the TIMER pin is multi-
plexed, the corresponding port control bits have to
be set in input with pull-up configuration through
the DDR, OR and DR registers. For more details,
please refer to the I/O Ports section.
Figure 28. fTIMER Clock in Gated Mode
Figure 29. Gated Mode Operation
TOUT DOUT
Timer
Function
Application
00
Event Counter
(input)
External counter clock
source
01
Gated input
(input)
External Pulse length
measurement
10
Output “0”
(output)
Output signal
11
Output “1”
(output)
generation
fPRESCALER
TIMER
fINT/12
fEXT
xx1
1
COUNTER VALUE
TIMER PIN
TIMER CLOCK
VALUE 1
VALUE 2
PULSE LENGTH
xx2
1
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