Rainbow Electronics ATmega8515L - Manual (Page 93)

93
ATmega8515(L)
2512A–AVR–04/02
the edge detector uses sampling, the maximum frequency of an external clock it can
detect is half the sampling frequency (Nyquist sampling theorem). However, due to vari-
ation of the system clock frequency and duty cycle caused by Oscillator source (crystal,
resonator, and capacitors) tolerances, it is recommended that maximum frequency of an
external clock source is less than f
clk_I/O
/2.5.
An external clock source can not be prescaled.
Figure 45. Prescaler for Timer/Counter0 and Timer/Counter1 (1)
Note: 1. The synchronization logic on the input pins ( T1/T0) is shown in Figure 44.
Special Function IO Register –
SFIOR
• Bit 0 – PSR10: Prescaler Reset Timer/Counter1 and Timer/Counter0
When this bit is written to one, the Timer/Counter1 and Timer/Counter0 prescaler will be
reset. The bit will be cleared by hardware after the operation is performed. Writing a
zero to this bit will have no effect. Note that Timer/Counter1 and Timer/Counter0 share
the same prescaler and a reset of this prescaler will affect both timers. This bit will
always be read as zero.
PSR10
Clear
clk
T1
clk
T0
T1
T0
clk
I/O
Synchronization
Synchronization
Bit 7 6 5 4 3 2 1 0
– XMBK XMM2 XMM1 XMM0 PUD – PSR10 SFIOR
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0