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LX51 User's Guide
LX51 Introduction Linking Programs Locating Program Objects Data Overlaying 
Code Banking 
Theory of Operation Configuration I/O Port XDATA Port User-Defined Common Area Bank Area Locating Modules Locating Segments Structuring Programs Examples Four 64K Code Banks On-chip ROM XDATA Port 32K Common Area Real-Time Programs Error MessagesI/O Port
The following configuration settings are required when additional address lines are connected to I/O Port lines (?B_MODE = 0).
| Name | Description |
|---|---|
| ?B_PORT | Used to specify the address of the internal data port. The SFR address of an internal data port must be specified. (For example: P1 as for port 1). |
| ?B_FIRSTBIT | Indicates which bit of the 8051 I/O port is to be assigned first. The value 3 indicates that port bit 3 is used as first port line for the address extension. If, for example, two address lines are used, P1.3 and P1.4 are allocated in this case. The remaining lines of the 8051 I/O port can be used for other purposes. |
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