mega328p 定时器2编译时出现TCCR2，OCR2，SFIOR寄存器未定义
编译器用的是winavr，MCU类型是atmega328p先随便写个程序验证
#include<avr/io.h>
int main(void)
{
OCR2=0X4A;
SFIOR=0X08;
TCCR2=0X7A;
while(1)；
}
编译时出现下面错误提示：
example.c:5:error:'OCR2' undeclared (first use in this function)
example.c:5:error:(Each undecleared identifier is reported only once)
example.c:5:error:for each funtion it appears in.)
example.c:6:error:'SFIOR' undeclared (first use in this function)
example.c:5:error:'TCCR2' undeclared (first use in this function)
我把mcu类型改为atmega8时，竟然便已通过了。各位大虾，能不能指点一二 我弄错了，TCCR2在atmega328p中有2个寄存器
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