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ST6215C Datasheet(PDF) 50 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) 50 Page - STMicroelectronics

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8-BIT TIMER (Cont’d)
9.2.4.2 Event Counter Mode
(TOUT = “0”, DOUT = “0”)
In this mode, the TIMER pin is the input clock of
the Timer prescaler which is decremented on eve-
ry rising edge of the input clock (allowing event
count). See Figure 30 and Figure 31.
This mode is selected by clearing the TOUT bit in
the TSCR register (i.e. as input) and clearing 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.
Figure 30. fTIMER Clock in Event Counter Mode
Figure 31. Event Counter Mode Operation
9.2.4.3 Output Mode
(TOUT = “1”, DOUT = “data out”)
In Output mode, the TIMER pin is connected to the
DOUT latch, hence the Timer prescaler is clocked
by the prescaler clock input (fINT/12). See Figure 32.
The user can select the prescaler division ratio us-
ing the PS[2:0] bits in the TSCR register. When TCR
decrements to zero, it sets the TMZ bit in the TSCR.
The TMZ bit can be tested under program control to
perform a timer function whenever it goes high and
has to be cleared by the user. The low-to-high TMZ
bit transition is used to latch the DOUT bit in the
TSCR and, if the TOUT bit is set, DOUT is trans-
ferred to the TIMER pin. This operating mode allows
external signal generation on the TIMER pin. See
Figure 33.
This mode is selected by setting the TOUT bit in
the TSCR register (i.e. as output) and setting the
DOUT bit to output a high level or clearing the
DOUT bit to output a low level.
Note: As soon as the TOUT bit is set, The timer
pin is configured as output push-pull regardless of
the corresponding I/O port control registers setting
(if the TIMER pin is multiplexed).
Figure 32. Output Mode Control
Figure 33. Output Mode Operation
fPRESCALER
TIMER
XX1
COUNTER VALUE
TIMER PIN
VALUE 1
VALUE 2
XX2
TMZ
TIMER
TOUT
DOUT
LATCH
FFh
1
Counter
TIMER PIN
1st downcount:
Default output value is 0
At each zero event
DOUT has to be
copied to the TIMER
pin
1


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