參數(shù)資料
型號(hào): ST92195D5T1/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP64
封裝: TQFP-64
文件頁(yè)數(shù): 234/250頁(yè)
文件大?。?/td> 3010K
代理商: ST92195D5T1/XXX
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ST92195 ST92T195 ST92E195 - STANDARD TIMER (STIM)
STANDARD TIMER (Cont’d)
7.2.2.4 Standard Timer Output Modes
OUTPUT modes are selected using 2 bits of the
STC register: OUTMD1 and OUTMD2.
No Output Mode (OUTMD1 = “0”, OUTMD2 = “0”)
The output is disabled and the corresponding pin
is set high, in order to allow other alternate func-
tions to use the I/O pin.
Square Wave Output Mode (OUTMD1 = “0”,
OUTMD2 = “1”)
The Standard Timer toggles the state of the
STOUT pin on every End Of Count condition. With
INTCLK = 24MHz, this allows generation of a
square wave with a period ranging from 333ns to
5.59 seconds.
PWM Output Mode (OUTMD1 = “1”)
The value of the OUTMD2 bit is transferred to the
STOUT output pin at the End Of Count. This al-
lows the user to generate PWM signals, by modi-
fying the status of OUTMD2 between End of Count
events, based on software counters decremented
on the Standard Timer interrupt.
7.2.3 Interrupt Selection
The Standard Timer may generate an interrupt re-
quest at every End of Count.
Bit 2 of the STC register (INTS) selects the inter-
rupt source between the Standard Timer interrupt
and the external interrupt pin. Thus the Standard
Timer Interrupt uses the interrupt channel and
takes the priority and vector of the external inter-
rupt channel.
If INTS is set to “1”, the Standard Timer interrupt is
disabled; otherwise, an interrupt request is gener-
ated at every End of Count.
Note: When enabling or disabling the Standard
Timer Interrupt (writing INTS in the STC register)
an edge may be generated on the interrupt chan-
nel, causing an unwanted interrupt.
To avoid this spurious interrupt request, the INTS
bit should be accessed only when the interrupt log-
ic is disabled (i.e. after the DI instruction). It is also
necessary to clear any possible interrupt pending
requests on the corresponding external interrupt
channel before enabling it. A delay instruction (i.e.
a NOP instruction) must be inserted between the
reset of the interrupt pending bit and the INTS
write instruction.
7.2.4 Register Mappingl
Each Standard Timer has 4 registers mapped into
Page 11 in Group F of the Register File
In the register description on the following page,
register addresses refer to STIM0 only.
STD Timer Register
Register Address
STIM0
STH0
R240 (F0h)
STL0
R241 (F1h)
STP0
R242 (F2h)
STC0
R243 (F3h)
STIM1
STH2
R248 (F8h)
STL2
R249 (F9h)
STP2
R250 (FAh)
STC2
R251 (FBh)
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