NCR RealPOS 70, User Manual

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12-8 Chapter 12: Cash Drawer Interface
GP_LVL2—GPIO Level for Input or Output 2 Register
Offset Address: GP38h Attribute: R/W
Default Value: 00000FFFh Size: 32-bit
Lockable: No Power Well: See below
Bit Description
31:12
Always 0. No corresponding GPIO.
11:0
GP_IO_SEL2[43:32]
—
R/W. When set to a 1, the corresponding GPIO
signal (if enabled in the GPIO_USE_SEL2 register) is programmed as
an input. When set to 0, the GPIO signal is programmed as an output.
Bit Description
31:12 Reserved. Read-only 0
11:0
GP_LVL2[43:32] — R/W. If GPIO[n] is programmed to be an output
(via the corresponding bit in the GP_IO_SEL2 register), then the
corresponding GP_LVL2[n] bit can be updated by software to drive a
high or low value on the output pin. 1 = high, 0 = low. If GPIO[n] is
programmed as an input, then the corresponding GP_LVL2 bit reflects
the state of the input signal (1 = high, 0 = low). Writes will have no
effect.
Since these bits correspond to GPIO that are in the core well, these bits
will be reset by PCIRST#.
Three GPO bits and one GPI bit of South Bridge ICH4 are used to
control the cash drawer(s). They are defined below:
GPIO 32 CD_SW_AB
Input 1, high Drawer(s) closed. Input 0, low Drawer(s) open.
GPIO 33 CD_SOL_A
Output 0, low turn off solenoid A. Output 1, high Activates
Solenoid A.
GPIO 34 CD_SOL_B
Output 0, low turn off solenoid B. Output 1, high Activates
Solenoid B.