Fametech POS-8017F Series, Руководство пользователя

Страница: 99 / 113

- 92 -
2. Programming Guide
To program the F71889 configuration registers, the following configuration procedures must be
followed in sequence:
1. Enter the Extended Function Mode.
2. Configure the configuration registers.
3. Exit the Extended Function Mode.
The configuration register is used to control the behavior of the corresponding devices.
To configure the register, use the index port to select the index and then writing data port to alter
the parameters.
The default index port and data port are 0x4E and 0x4F respectively.
Pull down the SOUT1 pin to change the default value to 0x2E/0x2F.
To enable configuration, the entry key 0x87 must be written to the index port.
To disable configuration, write exit key 0xAA to the index port.
Following is an example to enable configuration and disable configuration by using debug.
-0 4e 87
-0 4e 87 (enable configuration)
-0 4e aa (disable configuration)