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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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T48C862-R8
Figure 20.
Clock Module
OSC1
Osci
n
Ext. clock
ExI
n
*
ExOu
t
Stop
RC
oscillator 1
IN1
Cin
IN2
Divide
r
/2
/2
/2
/2
SYSCL
RC oscillator2
R
Trim
RCOut2
Stop
Stop
RCOut1
Control
4-MHz oscillator
Osci
n
Oscou
t
4Out
Stop
OSC2
Oscou
t
32-kHz oscillator
Osci
n
Oscou
t
32Out
Osc-
Stop
CM:
Sleep
WDL
Cin/16
NSTOP
CCS
CSS1
CSS0
32
kHz
SUBCL
*
*
Configurable
SC:
BOT
---
OS1
OS0
Table 3.
Clock Modes
Clock Source for SYSCL
Mode
1
2
3
4
OS1
1
0
1
0
OS0
1
1
0
0
CCS = 1
RC-oscillator 1 (internal)
RC-oscillator 1 (internal)
RC-oscillator 1 (internal)
RC-oscillator 1 (internal)
CCS = 0
External input clock
RC-oscillator 2 with
external trimming
resistor
4-MHz oscillator
32-kHz oscillator
Clock Source
for SUBCL
C
in
/16
C
in
/16
C
in
/16
32 kHz
The clock module generates two output clocks. One is the system clock (SYSCL) and
the other the periphery (SUBCL). The SYSCL can supply the core and the peripherals
and the SUBCL can supply only the peripherals with clocks. The modes for clock
sources are programmable with the OS1-bit and OS0-bit in the SC-register and the
CCS-bit in the CM-register.
Oscillator Circuits and
External Clock Input
Stage
RC-oscillator 1
Fully Integrated
The microcontroller block series consists of four different internal oscillators: two RC-
oscillators, one 4-MHz crystal oscillator, one 32-kHz crystal oscillator and one external
clock input stage.
For timing insensitive applications, it is possible to use the fully integrated RC
oscillator 1. It operates without any external components and saves additional costs.
The RC-oscillator 1 center frequency tolerance is better than 鹵50% over the full temper-
ature and voltage range. The basic center frequency of the RC-oscillator 1 is
f
O
祿
3.8 MHz. The RC oscillator 1 is selected by default after power-on reset.
25
4590B鈥?BMCU鈥?2/03

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