Intermec 074787-001 Manual De Usuario

Each battery pack contains a 1-wire ID, 256 bit, EEPROM from Dallas 
Semiconductor (Maxim), DS2430A. The 1-wire interfaces for battery A 
and B (ID-A and ID-B) are connected to PE23 and PE25, respectively. 

These pins are configured as open drain outputs. (PEODR[OD23,OD25] 
= 1)

Sleep mode is necessary to provide adequate battery life. When not 
printing, the printer should be in sleep mode. This section describes steps 
that need to be taken to enter sleep mode. 

To enter sleep mode, the steps below should be done in the order presented 
in this document. To exit sleep mode, the settings and steps should be 
reversed.

The print controller and engine consume the greatest amount of power in 
the printer. Even when not printing, U2 consumes a lot of power. 
Therefore, when not printing, it is very important to power down the print 
controller. 

To power down the print controller PC_PWR_EN (PE24) must be output 
low. See 

 for details.

When in sleep mode, the UART and USB baud rate generators, BRGx, 
should be disabled. This is done by clearing BRGCx[EN]. 

The SCC is powered down by clearing GSMR_L[ENT, ENR].

The SMC is powered down by clearing SMCMR[TEN, REN].

The SPI is powered down by clearing SPMODE[EN].

Put the SDRAM in self refresh mode. See 

for details.

While in self refresh mode the CLKOUT buffer should be disabled to 
conserve power. This is done by setting SCCR[COM] = 11. SCCR[COM] 
must be cleared (00) before exiting self refresh mode.

The last step to take when entering sleep mode is to put the MPC875 into 
Normal Low mode.

Note: If a connection with the printer is established (USB, Serial, or 
Bluetooth), do not disable the corresponding baud rate generators or SCC.