Motorola 8900 User Manual - Page 33

Operating Modes, Table 2-1

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Chapter 2: Hardware Interface Description Operating Modes C24 incorporates several operating modes. Each operating mode is different in the active features and interfaces. Table 2-1 summarizes the general characteristics of the C24 operating modes and provides general guidelines for operation. Mode Not Powered RTC Mode Idle Mode Sleep Mode CSD call or GPRS data Table 2-1: C24 Operating Modes Description VCC supply is disconnected. Valid VCC supply. RESET_N signal is enabled (low). RESET_N signal is disabled (high). CTS_N and DSR_N signals are enabled (low). RESET_N signal is high. CTS_N signal is disabled. RESET_N signal is high. TXEN_N signal is Enabled (Low). Features The C24 is Off. Any signals connected to the interface connector must be set low or tri-state. The C24 Interfaces are Off. Only the internal RTC timer is operating. Any signals connected to the interface connector must be set low or tri-stated. The C24 is fully active, registered to the network and ready to communicate. This is the default power-up mode. The C24 is in low power mode. The application interfaces are disabled, but, C24 continues to monitor the network. A voice or data call is in progress.When the call terminates, C24 returns to the last operating state (Idle or Sleep). December 15, 2008 C24 Module Hardware Description 9

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Chapter 2: Hardware Interface Description
December 15, 2008
C24 Module Hardware Description
9
Operating Modes
C24 incorporates several operating modes. Each operating mode is different in the active features
and interfaces.
Table 2-1
summarizes the general characteristics of the C24 operating modes and provides
general guidelines for operation.
Table 2-1:
C24
Operating Modes
Mode
Description
Features
Not Powered
VCC supply is disconnected.
The C24 is Off.
Any signals connected to the interface con-
nector must be set low or tri-state.
RTC Mode
Valid VCC supply.
RESET_N signal is enabled (low).
The C24 Interfaces are Off. Only the internal
RTC timer is operating. Any signals
connected to the interface connector must be
set low or tri-stated.
Idle Mode
RESET_N signal is disabled (high).
CTS_N and DSR_N signals are enabled
(low).
The C24 is fully active, registered to the net-
work and ready to communicate.
This is the default power-up mode.
Sleep Mode
RESET_N signal is high.
CTS_N signal is disabled.
The C24 is in low power mode.
The application interfaces are disabled, but,
C24 continues to monitor the network.
CSD call or
GPRS data
RESET_N signal is high.
TXEN_N signal is Enabled (Low).
A voice or data call is in progress.When the
call terminates, C24 returns to the last operat-
ing state (Idle or Sleep).