ADUC7122 Analog Devices, ADUC7122 Datasheet - Page 52

• Manufacturer Part Number: ADUC7122
• Description: Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI® MCU
• Manufacturer: Analog Devices

Specifications of ADUC7122

• Mcu Core: ARM7 TDMI
• Mcu Speed (mips): 40
• Sram (bytes): 8192Bytes
• Gpio Pins: 32
• Adc # Channels: 13

ADuC7122
GENERAL-PURPOSE I/O
The ADuC7122 provides 32 general-purpose, bidirectional I/O
(GPIO) pins. All I/O pins are 5 V tolerant, meaning that the
GPIOs support an input voltage of 5 V. In general, many of the
GPIO pins have multiple functions (see Table 84). By default, the
GPIO pins are configured in GPIO mode.
All GPIO pins have an internal pull-up resistor (of about 100 kΩ),
and their drive capability is 1.6 mA. Note that a maximum of
20 GPIOs can drive 1.6 mA at the same time. The 32 GPIOs are
grouped in four ports: Port 0 to Port 3. Each port is controlled
by four or five MMRs, with x representing the port number.
Table 82. GPxCON Register
Name
GP0CON
GP1CON
GP2CON
GP3CON
The input level of any GPIO can be read at any time in the
GPxDAT MMR, even when the pin is configured in a mode
other than GPIO. The PLA input is always active.
When the ADuC7122 parts enter a power-saving mode, the
GPIO pins retain their state.
GPxCON is the Port x control register, and it selects the
function of each pin of Port x, as described in Table 84.
Table 83. GPxCON MMR Bit Designations
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
Address
0xFFFF0D00
0xFFFF0D04
0xFFFF0D08
0xFFFF0D0C
Description
Reserved
Select function of Px.7 pin
Reserved
Select function of Px.6 pin
Reserved
Select function of Px.5 pin
Reserved
Select function of Px.4 pin
Reserved
Select function of Px.3 pin
Reserved
Select function of Px.2 pin
Reserved
Select function of Px.1 pin
Reserved
Select function of Px.0 pin
Default Value
0x00000000
0x00000000
0x00000000
0x11111111
Access
R/W
R/W
R/W
R/W
Rev. 0 | Page 52 of 96
Table 84. GPIO Pin Function Designations
Port
0
1
2
3
1
2
2
N/A means no secondary function exists.
Never attempt a write to P1.2 or P1.3.
P2.0
P3.0
Pin
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.0
P1.1
P1.4
P1.5
P1.6
P1.7
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7/BM
00
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO/IRQ0
GPIO/IRQ1
GPIO
GPIO/IRQ2
GPIO
GPIO
GPIO/IRQ3
GPIO
GPIO
GPIO
GPIO/IRQ4
GPIO/IRQ5
GPIO
GPIO
GPIO
GPIO
Configuration (see GPxCON)
01
SCL1
SDA1
SPICLK
SPIMISO
SPIMOSI
SPICS
MRST
TRST
SIN
SOUT
PWM1
PWM2
N/A
N/A
N/A
N/A
N/A
N/A
PWM5
PWM6
N/A
N/A
N/A
N/A
PWM3
PWM4
N/A
N/A
N/A
N/A
10
N/A
N/A
ADC
SYNC
TRIP
CONVST
N/A
N/A
SCL2
SDA2
ECLK/XCLK
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1
BUSY
11
PLAI[5]
PLAI[4]
PLAO[13]
PLAO[12]
PLAI[11]
PLAI[10]
PLAI[2]
PLAI[3]
PLAI[7]
PLAI[6]
PLAI[8]
PLAI[9]
PLAO[5]
PLAO[4]
PLAI[13]
PLAI[12]
PLAI[1]
PLAI[14]
PLAO[7]
PLAO[6]
PLAI[15]
PLAI[0]
PLAO[0]
PLAO[1]
PLAO[2]
PLAO[3]
PLAO[8]
PLAO[9]
PLAO[10]
PLAO[11]