ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 60

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 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: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

8.1.1
8.1.2
60
Atmel ATmega16/32/64/M1/C1
Moving Interrupts Between Application and Boot Space
MCU Control Register – MCUCR
When the BOOTRST Fuse is programmed, the Boot section size set to 2K bytes and the
IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most typical
a n d g e n e r a l p r o g r a m s e t u p f o r t h e R e s e t a n d I n t e r r u p t V e c t o r A d d r e s s e s i n
ATmega16/32/64/M1/C116/32 is:
The MCU Control Register controls the placement of the Interrupt Vector table.
• Bit 1 – IVSEL: Interrupt Vector Select
When the IVSEL bit is cleared (zero), the Interrupt Vectors are placed at the start of the Flash
memory. When this bit is set (one), the Interrupt Vectors are moved to the beginning of the
Boot Loader section of the Flash. The actual address of the start of the Boot Flash Section is
determined by the BOOTSZ Fuses. Refer to the section
Read-While-Write Self-Programming ATmega16/32/64/M1/C1” on page 279
avoid unintentional changes of Interrupt Vector tables, a special write procedure must be fol-
lowed to change the IVSEL bit:
Bit
Read/Write
Initial Value
0xC02
0xC03
0xC04
0xC05
Address Labels Code
;
.org 0xC00
0xC00
0xC02
0xC04
...
0xC3C
;
0xC3E
0xC3F
0xC40
0xC41
0xC42
0xC43
1. Write the Interrupt Vector Change Enable (IVCE) bit to one.
2. Within four cycles, write the desired value to IVSEL while writing a zero to IVCE.
RESET: ldi
SPIPS
R/W
7
0
ldi
out
sei
<instr>
jmp
jmp
jmp
...
jmp
out
ldi
out
sei
<instr>
R
6
–
0
r16,low(RAMEND)
SPL,r16
RESET
ANA_COMP_0
ANA_COMP_1
...
SPM_RDY
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
xxx
xxx
R
5
–
0
PUD
R/W
4
0
; Enable interrupts
Comments
; Reset handler
; Analog Comparator 0 Handler
; Analog Comparator 1 Handler
;
; Store Program Memory Ready Handler
; Set Stack Pointer to top of RAM
; Enable interrupts
R
3
–
0
R
2
–
0
“Boot Loader Support –
IVSEL
R/W
1
0
IVCE
R/W
0
0
for details. To
7647G–AVR–09/11
MCUCR