ATmega162 Atmel Corporation, ATmega162 Datasheet - Page 65

• Manufacturer Part Number: ATmega162
• Manufacturer: Atmel Corporation

Specifications of ATmega162

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 35
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 6
• Input Capture Channels: 2
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Reading the Pin Value
2513K–AVR–07/09
Switching between input with pull-up and output low generates the same problem. The user
must use either the tri-state ({DDxn, PORTxn} = 0b00) or the output high state ({DDxn, PORTxn}
= 0b11) as an intermediate step.
Table 27
Table 27. Port Pin Configurations
Independent of the setting of Data Direction bit DDxn, the port pin can be read through the
PINxn Register bit. As shown in
tute a synchronizer. This is needed to avoid metastability if the physical pin changes value near
the edge of the internal clock, but it also introduces a delay.
the synchronization when reading an externally applied pin value. The maximum and minimum
propagation delays are denoted t
Figure 30. Synchronization when Reading an Externally Applied Pin Value
DDxn
0
0
0
1
1
INSTRUCTIONS
summarizes the control signals for the pin value.
PORTxn
SYSTEM CLK
SYNC LATCH
0
1
1
0
1
PINxn
(in SFIOR)
r17
PUD
X
0
1
X
X
Figure
Output
Output
pd,max
Input
Input
Input
I/O
XXX
29, the PINxn Register bit and the preceding latch consti-
and t
Pull-up
Yes
pd,min
No
No
No
No
t
pd, max
0x00
respectively.
XXX
Comment
Tri-state (Hi-Z)
Pxn will source current if ext. pulled
low.
Tri-state (Hi-Z)
Output Low (Sink)
Output High (Source)
t
pd, min
Figure 30
in r17, PINx
ATmega162/V
shows a timing diagram of
0xFF
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