at94k10al ATMEL Corporation, at94k10al Datasheet - Page 90

• Manufacturer Part Number: at94k10al
• Description: At94k05al 5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
• Manufacturer: ATMEL Corporation

4.25
90
8-bit Timers/Counters T/C0 and T/C2
AT94KAL Series FPSLIC
Figure 4-26. Timer/Counter2 Prescaler
Special Function I/O Register – SFIOR
• Bits 7..2 - Res: Reserved Bits
These bits are reserved bits in the FPSLIC and are always read as zero.
• Bit 1 - PSR2: Prescaler Reset Timer/Counter2
When this bit is set (one) the Timer/Counter2 prescaler will be reset. The bit will be cleared by
the hardware after the operation is performed. Writing a zero to this bit will have no effect. This
bit will always be read as zero if Timer/Counter2 is clocked by the internal CPU clock. If this bit is
written when Timer/Counter2 is operating in asynchronous mode; however, the bit will remain as
one until the prescaler has been reset. See
page 99
• Bit 0 - PSR10: Prescaler Reset Timer/Counter1 and Timer/Counter0
When this bit is set (one) the Timer/Counter1 and Timer/Counter0 prescaler will be reset. The bit
will be cleared by the 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.
Figure 4-27
for Timer/Counter2.
Bit
$30 ($50)
Read/Write
Initial Value
TOSC1
for a detailed description of asynchronous operation.
PSR2
CS20
CS21
CS22
AS2
CK
shows the block diagram for Timer/Counter0.
7
-
R
0
6
-
R
0
PCK2
5
-
R
0
Clear
4
-
R
0
TIMER/COUNTER2 CLOCK SOURCE
“Asynchronous Operation of Timer/Counter2” on
3
-
R
0
0
10-BIT T/C PRESCALER
TCK2
2
-
R
0
Figure 4-28
1
PSR2
R/W
0
shows the block diagram
0
PSR10
R/W
0
SFIOR
1138I–FPSLI–1/08