ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 54
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ATmega48 Automotive
Manufacturer Part Number
ATmega48 Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega48 Automotive
Flash (kbytes)
4 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
256
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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11.2.3
11.2.4
54
Atmel ATtiny24/44/84 [Preliminary]
GIFR – General Interrupt Flag Register
PCMSK1 – Pin Change Mask Register 1
• Bit 4– PCIE0: Pin Change Interrupt Enable 0
When the PCIE0 bit is set and the I-bit in the Status Register (SREG) is set, pin change inter-
rupt 0 is enabled. Any change on any enabled PCINT7..0 pin will cause an interrupt. The
corresponding interrupt of pin change interrupt request is executed from the PCI0 interrupt
vector. PCINT7..0 pins are enabled individually by the PCMSK0 register.
• Bits 7, 3..0 – Res: Reserved Bits
These bits are reserved bits in the ATtiny24/44/84 and will always read as zero.
• Bit 6 – INTF0: External Interrupt Flag 0
When an edge or logic change on the INT0 pin triggers an interrupt request, INTF0 becomes
set (logical one). If the I-bit in SREG and the INT0 bit in GIMSK are set (one), the MCU will
jump to the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is
executed. Alternatively, the flag can be cleared by writing a logical one to it. This flag is always
cleared when INT0 is configured as a level interrupt.
• Bit 5 – PCIF1: Pin Change Interrupt Flag 1
When a logic change on any PCINT11..8 pin triggers an interrupt request, PCIF1 becomes set
(logical one). If the I-bit in SREG and the PCIE1 bit in GIMSK are set (one), the MCU will jump
to the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is exe-
cuted. Alternatively, the flag can be cleared by writing a logical one to it.
• Bit 4– PCIF0: Pin Change Interrupt Flag 0
When a logic change on any PCINT7..0 pin triggers an interrupt request, PCIF becomes set
(logical one). If the I-bit in SREG and the PCIE0 bit in GIMSK are set (one), the MCU will jump
to the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is exe-
cuted. Alternatively, the flag can be cleared by writing a logical one to it.
• Bits 7, 4– Res: Reserved Bits
These bits are reserved bits in the Atmel
Bit
0x3A (0x5A
Read/Write
Initial Value
Bit
0x20 (0x40)
Read/Write
Initial Value
R
7
–
0
R
7
–
0
INTF0
R
6
–
0
R/W
6
0
PCIF1
R
0
5
–
R/W
5
0
®
R
4
–
0
PCIF0
ATtiny24/44/84 and will always read as zero.
R/W
4
0
PCINT11
R/W
3
0
R
3
–
0
PCINT10
R/W
2
0
R
2
–
0
PCINT9
R/W
1
0
R
1
–
0
PCINT8
R/W
0
0
0
–
R
0
7701E–AVR–02/11
PCMSK1
GIFR
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