參數(shù)資料
型號(hào)： M44C090-H
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Low-Current Microcontroller for Wireless Communication
中文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁數(shù)： 26/63頁
文件大?。?/td> 503K
代理商： M44C090-H
M44C890
M44C090
Rev.A4, 14-Dec-01
26 (63)
3.3.1
Timer 1
The Timer 1 is an interval timer which can be used to gen-
erate periodical interrupts and as prescaler for Timer 2,
Timer 3, the serial interface and the watchdog function.
The Timer 1 consists of a programmable 14-stage divider
that is driven by either SUBCL or SYSCL. The timer out-
put signal can be used as prescaler clock or as SUBCL and
as source for the Timer 1 interrupt. Because of other
system requirements the Timer 1 output T1OUT is
synchronized with SYSCL. Therefore in the power-down
mode SLEEP (CPU core
–
> sleep and OSC-Stop
–
> yes)
the output T1OUT is stopped (T1OUT=0). Nevertheless
the Timer 1 can be active in SLEEP and generate Timer 1
interrupts. The interrupt is maskable via the T1IM bit and
the SUBCL can be bypassed via the T1BP bit of the T1C2
register. The time interval for the timer output can be pro-
grammed via the Timer 1 control register T1C1.
This timer starts running automatically after any
power-on reset ! If the watchdog function is not activated,
the timer can be
restarted
by writing into the T1C1
register with T1RM=1.
Timer 1 can also be used as a watchdog timer to prevent
a system from stalling. The watchdog timer is a 3-bit
counter that is supplied by a separate output of Timer 1.
It generates a system reset when the 3-bit counter
overflows. To avoid this, the 3-bit counter must be reset
before it overflows. The application software has to
accomplish this by reading the CWD register.
After power-on reset the watchdog must be activated by
software in the $RESET initialization routine. There are
two watchdog modes, in one mode the watchdog can be
switched on and off by software, in the other mode the
watchdog is active and locked. This mode can only be
stopped by carrying out a system reset.
The watchdog timer operation mode and the time interval
for the watchdog reset can be programmed via the
watchdog control register (WDC).
13766
Prescaler
14 bit
CL1
Watchdog
4 bit
MUX
WDCL
T1IM
T1BP
T1MUX
NRST
INT2
T1OUT
T1CS
SYSCL
SUBCL
Figure 27. Timer 1 module
Q5
Q1 Q2 Q3 Q4
Q6
Q8
Q8
Q11
Q11
Q14
Q14
RES
CL
Decoder
Watchdog
mode control
MUX for interval timer
Decoder
MUX for watchdog timer
T1RM T1C2 T1C1 T1C0
3
2
WDL WDR WDT1 WDT0
WDC
RES
T1MUX
SUBCL
T1BP T1IM
T1IM=0
T1IM=1
INT2
T1OUT
T1C2
RESET
(NRST)
Watchdog
Divider / 8
Divider
RESET
T1C1
Write of the
T1C1 register
CL1
13767
WDCL
Read of the
CWD register
Figure 28. Timer 1 and watchdog
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