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ST6215C Datasheet(PDF) 49 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST6215C Datasheet(HTML) 49 Page - STMicroelectronics

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8-BIT TIMER (Cont’d)
9.2.4 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 12.
Table 12. Timer Operating Modes
9.2.4.1 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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