Intel PXA27x Series, Руководство пользователя

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Intel
®
PXA27x Processor Developer’s Kit - User’s Guide 53
3.2.2 Memory-Mapped Main Board Registers
To access the actual registers described in the following subsections, use the physical address listed
for each register. These registers are implemented in the field-programmable gate array (FPGA) on
the main board (see
Section 2.2.4, “Main Board Registers and Interrupt Controller (FPGA)” on
page 23 ).
3.2.2.1 Hex LED Data Register 1 (LEDDAT1)
LEDDAT1, defined in Table 18 , contains eight read/write bit fields, one for each digit of the
seven-segment hex LED displays on the main board. To display a hexadecimal digit, write its hex
value to the desired bit field. For locations and more information about the hex LED displays, see
Figure 3 on page 16 and Table 4 on page 33 .
To control the decimal points and dots , see Section 3.2.2.2 . To blank the digits , see
Section 3.2.2.3 .
Table 18. LEDDAT1 Bit Definitions
Physical Addresses: 0x0800_0010 LEDDAT1 Intel
®
PXA27x Processor Developer’s Kit
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name DIGIT7 DIGIT6 DIGIT5 DIGIT4 DIGIT3 DIGIT2 DIGIT1 DIGIT0
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Access Description
31:28 DIGIT7 R/W HEX1 digit 1 (U76) = four bits of hex data (most significant digit)
27:24 DIGIT6 R/W HEX1 digit 2 (U76)
23:20 DIGIT5 R/W HEX1 digit 3 (U76)
19:16 DIGIT4 R/W HEX1 digit 4 (U76)
15:12 DIGIT3 R/W HEX0 digit 1 (U75)
11:8 DIGIT2 R/W HEX0 digit 2 (U75)
7:4 DIGIT1 R/W HEX0 digit 3 (U75)
3:0 DIGIT0 R/W HEX0 digit 4 (U75) (least significant digit)