st52t430 STMicroelectronics, st52t430 Datasheet - Page 51

• Manufacturer Part Number: st52t430
• Description: 8-bit Intelligent Controller Unit Icu Three Timer/pwms, Adc, Sci
• Manufacturer: STMicroelectronics

Figure 10.2 Timer 0 External START/STOP Mode
NOTE: The external clock signal applied on the
T0CLK pin must have a frequency at least two
times smaller than the internal master clock.
The prescaler output can be selected by setting the
PRESCx bit of REG_CONF6, REG_CONF9 and
REG_CONF11 registers (see Table 10.2, Table
10.5 and Table 10.7).
TxRES resets the content of the 8-bit counter x to
zero. It is generated by the TIRSTx and TxMSK
bits of REG_CONF5, REG_CONF7, REG_CONF8
and REG_CONF10 registers (see Table 10.1,
Table 10.3, Table 10.4 and Table 10.6).
TxSTRT signal starts/stops Timer x counting only
if the peripherals are configured in Timer mode.
This signal is forced by setting the correspondent
TISTRx bit of REG_CONF5, REG_CONF8 and
REG_CONF10 registers (see Table 10.1, Table
10.4 and Table 10.6).
TxMSK bits mask the reset of each timer and can
be utilized to synchronize a simultaneous start of
the timers by means (for example), of the following
procedure, which starts three timers:
1) TIRST0 = TIRST1 = TIRST2 = 0,
2) TISTR0 = TISTR1 = TISTR2 = 0,
3) T0MSK = T1MSK = T2MSK = 1,
4) TIRST0 = TIRST1 = TIRST2 = 1,
5) TISTR0 = TISTR1 = TISTR2 = 1,
6) T0MSK = T1MSK = T2MSK = 0,
Counted
Value
Level
Edge
Clock
Reset
start
0
start
1
2
3
When
reset.htfgdhtdfhfd
Figure 10.3 TIMEROUT Signal Type
TIMER 0 START/STOP can be provided externally
on the T0STRT pin. In this case, the T0STRT
signal allows the user to work in two different
modes by setting the TESTR configuration bit of
REG_CONF5 register (see Figure 10.2) (Input
capture):
LEVEL (Time Counter): If the T0STRT signal is
high the Timer starts counting. When T0STRT is
low the counting ceases and the current value is
stored in the PWM_0_COUNT Input Register.
stop
Prescout*Counter
4
TxMSK
stop
4
is
start
1
0
the
start
Timer Output
Type 1
Type 2
TIMER
1
x
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is