Timer/counter0 control register – tccr0 – Rainbow Electronics AT90S8515 User Manual
Page 33
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33
AT90S8515
0841G–09/01
Figure 29. Timer/Counter0 Block Diagram
Timer/Counter0 Control
Register – TCCR0
• Bits 7..3 – Res: Reserved Bits
These bits are reserved bits in the AT90S8515 and always read as zero.
• Bits 2, 1, 0 – CS02, CS01, CS00: Clock Select0, Bits 2, 1 and 0
The Clock Select0 bits 2, 1 and 0 define the prescaling source of Timer/Counter0.
Bit
7
6
5
4
3
2
1
0
$33 ($53)
–
–
–
–
–
CS02
CS01
CS00
TCCR0
Read/Write
R
R
R
R
R
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 7. Clock 0 Prescale Select
CS02
CS01
CS00
Description
0
0
0
Stop, the Timer/Counter0 is stopped.
0
0
1
CK
0
1
0
CK/8
0
1
1
CK/64
1
0
0
CK/256
1
0
1
CK/1024
1
1
0
External Pin T0, falling edge
1
1
1
External Pin T0, rising edge
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