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AM1808AZCED4 Fiches technique(PDF) 21 Page - Texas Instruments

No de pièce AM1808AZCED4
Description  AM1808 ARM Microprocessor
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AM1808
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SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
3.7.3
Real-Time Clock and 32-kHz Oscillator
Table 3-5. Real-Time Clock (RTC) and 1.2-V, 32-kHz Oscillator Terminal Functions
SIGNAL
POWER
TYPE(1)
PULL(2)
DESCRIPTION
GROUP(3)
NAME
NO.
RTC_XI
J19
I
RTC 32-kHz oscillator input
RTC_XO
H19
O
RTC 32-kHz oscillator output
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP
F4
O
CP[0]
A
RTC Alarm
RTC module core power
RTC_CVDD
L14
PWR
(isolated from chip CVDD)
RTC_Vss
H18
GND
Oscillator ground (for filter)
(1)
I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for
that particular peripheral.
(2)
IPD = Internal Pulldown resistor; IPU = Internal Pullup resistor; CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. The pull-up and pull-down control of these pins is not active until the
device is out of reset. During reset, all of the pins associated with these registers are weakly pulled down. If the application requires a
pull-up, an external pull-up can be used.
(3)
This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can
be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of
power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power
supply DVDD3318_C.
3.7.4
DEEPSLEEP Power Control
Table 3-6. DEEPSLEEP Power Control Terminal Functions
SIGNAL
POWER
TYPE(1)
PULL(2)
DESCRIPTION
GROUP(3)
NAME
NO.
RTC_ALARM / UART2_CTS / GP0[8] / DEEPSLEEP
F4
I
CP[0]
A
DEEPSLEEP power control output
(1)
I = Input, O = Output, I/O = Bidirectional, Z = High impedance, PWR = Supply voltage, GND = Ground, A = Analog signal.
Note: For multiplexed pins where functions have different types (ie., input versus output), the table reflects the pin function direction for
that particular peripheral.
(2)
IPD = Internal Pulldown resistor; IPU = Internal Pullup resistor; CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. The pull-up and pull-down control of these pins is not active until the
device is out of reset. During reset, all of the pins associated with these registers are weakly pulled down. If the application requires a
pull-up, an external pull-up can be used.
(3)
This signal is part of a dual-voltage IO group (A, B or C). These groups can be operated at 3.3V or 1.8V nominal. The three groups can
be operated at independent voltages but all pins withina group will operate at the same voltage. Group A operates at the voltage of
power supply DVDD3318_A. Group B operates at the voltage of power supply DVDD3318_B. Group C operates at the voltage of power
supply DVDD3318_C.
Copyright © 2010, Texas Instruments Incorporated
Device Overview
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