NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 86

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7 4
G E N m o d u l e r e g i s t e r s
The PORTA register configures the PORTA general-purpose input/output (GPIO) pins.
Each of the PORTA GPIO pins can be individually programmed — as general-purpose
input or output, or special function input or output — as applicable. Table 29
describes the PORTA register; Table 30 shows the different configurations for each
bit.
Register bit assignment
Table 29: PORTA register bit definition
D31:24
D23:16
D15:08
Bits
15
31
30
14
R/W
R/W
N/A
Access
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
29
13
28
12
Reserved
AMODE
AMODE
ADIR
Reserved
Mnemonic
27
11
26
10
0
0
N/A
Reset
25
9
24
8
PORTA mode configuration
0
1
Configures the individual PORTA pins. Each bit in the
AMODE field corresponds to one of the PORTA bits; D31
controls PORTA7, D30 controls PORTA6, and so on.
PORTA data direction
0
1
Configures the individual PORTA pins. Each bit in the
ADIR field corresponds to one of the PORTA bits; D23
controls PORTA7, D22 controls PORTA6, and so on.
N/A
Description
Selects GPIO mode
Selects special function mode
Selects input mode
Selects output mode
23
7
22
6
21
5
20
4
ADATA
ADIR
19
3
18
2
17
1
16
0