Intel PXA27x Series, Руководство пользователя

Страница: 54 / 88

54 Intel
®
PXA27x Processor Developer’s Kit - User’s Guide
3.2.2.2 Hex LED Data Register 2 (LEDDAT2)
LEDDAT2, defined in Table 19 , contains 16 read/write bits to control the seven-segment LED dots.
For locations and more information about the hex LED displays, see Figure 3 on page 16 and
Table 4 on page 33 . For more information on the dot names, see the Liteon LTC-4627JF data sheet.
To assign values to the digits , see Section 3.2.2.1 . To blank the digits , see Section 3.2.2.3 .
Note: Ignore reads from reserved bits. Write 0b0 to reserved bits.
Table 19. LEDDAT2 Bit Definitions
Physical Address: 0x0800_0014 LEDDAT2 Intel
®
PXA27x Processor Developer’s Kit
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name
D
IGIT7DP
D
IGIT6DP
D
IGIT5DP
D
IGIT4DP
D
IGIT3DP
D
IGIT2DP
D
IGIT1DP
D
IGIT0DP
reserved
HE
X1
L3
HE
X1
L2
HE
X1
L1
HE
X0
L3
HE
X0
L2
HE
X0
L1
Reset 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1
Bits Name Access Description
15:8 DIGITxDP R/W
Control the seven-segment LED decimal points:
0 = decimal point ON
1 = decimal point OFF
7:6 — — reserved
5:3 HEX1Lx R/W
Control the seven-segment LED dots for HEX1:
0 = dot ON
1 = dot OFF
2:0 HEX0Lx R/W
Control the seven-segment LED dots for HEX0:
0 = dot ON
1 = dot OFF