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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • 1463.36KB

  • Atmel   Atmel

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Figure 32.
UTCM Block Diagram
SYSCL
SUBCL
from clock module
Timer 1
Watchdog
MUX
Interval / Prescaler
NRST
INT2
T1OUT
Timer 3
Capture 3
Control
Demodu-
lator 3
Modu-
lator 3
INT5
T3O
T3I
MUX
8-bit Counter 3
Compare 3/1
Compare 3/2
TOG3
Timer 2
4-bit Counter 2/1
MUX
Compare 2/1
Modu-
lator 2
I/O bus
T2O
POUT
T2I
MUX
DCG
Control
8-bit Counter 2/2
INT4
Compare 2/2
TOG2
SSI
Receive buffer
SCL
MUX
8-bit shift register
Transmit buffer
Control
INT3
SC
SD
Timer 1
The Timer 1 is an interval timer which can be used to generate 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 output 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 out-
put 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 programmed via the
Timer 1 control register T1C1.
This timer starts running automatically after any power-on reset! If the watchdog func-
tion is not activated, the timer can be restarted by writing into the T1C1 register with
T1RM = 1.
40
T48C862-R8
4590B鈥?BMCU鈥?2/03

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