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73S12xxF Software User Guide UG_12xxF_016

20 Rev. 1.50

4.1.2 External Data Memory

The 2 KB of XRAM are available at address locations 0x0000 through 0x07FF. The upper 1K bytes of

the external data memory space (from 0xFC00 to 0xFFFF) is reserved for additional special function

registers for the 73S12xxF chip and is segmented as shown in Table 1.

Table 1: Upper 1 KB External Data Memory layout

Function Space # Bytes Starting Address Ending Address

Peripheral Control

128

0xFF80

0xFFFF

Smart Card Control 384 0xFE00 0xFF7F

USB Control 512 0xFC00 0xFDFF

4.1.3 Internal Data Memory

The 256 bytes of IRAM are available for use as scratch-pad RAM.

The IRAM Special Function Registers are mapped as shown in Table 2. All registers appearing in the

first column (000b) are bit-addressable:

Table 2: IRAM Special Function Register Map

HEX/BIN

000b

001b

010b

011b

100b

101b

110b

111b

0xF8 - 0xFF

0xF0 - 0xF7 b

0xE8 - 0xEF

0xE0 - 0xE7 acc

0xD8 - 0xDF wdcon

0xD0 - 0xD7 psw kcol krow kscan kstat ksize korderl korderh

0xC8 - 0xCF t2con

0xC0 - 0xC7 ircon

0xB8 - 0xBF ien1 ip1 s0relh s1relh

0xB0 - 0xB7 p3 flshctl pgadr

0xA8 - 0xAF ien0 ip0 s0rell

0xA0 - 0xA7 usr15

udir15

0x98 - 0x9F s0con sobuf ien2 s1con s1buf s1rell

0x90 - 0x97 usr70 udir70 dps erase

0x88 - 0x8F tcon tmod tl0 tl1 th0 th1 ckcon mclkctl

0x80 - 0x87 sp dp1 dph dpl1 dph1 wdtrel pcon

4.2 Low-level API

A low-level Application Programming Interface (API) is provided to control all hardware peripherals. An

application can link to the low-level API library to utilize the functions described in subsequent sections.

Before using the low-level API, an embedded application should call the API_Init() routine in the

beginning of the program as part of its initialization. As a general guideline, any feature to be included or

used in an application must first call its associated initialization routine. For example, to link the USB

module into an application, USB_Init() must first be called to initialize its associated registers for the USB

functions.

Each feature available with the 73S12xxF device has a sample application to demonstrate the library

function’s usage.

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