W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 73

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
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5.2.7 TIMER REGISTERS
There are four registers included in the Timer. The IO address map is allocated from 0xf0000040 to 0xf0000043.
Table 5.2.7-1 Timer Register Map
Timer Control Register1 (TCR1)
Port address : 0x00000040
Bit 0
Bit1
Bit2
Bit24_31 Pre-Scalar : A pre-scalar value can be used to divide the input clock.
TI
0
Port Addr.
BA + 0x40
BA + 0x41
BA + 0x42
BA + 0x43
CE
1
Counter Enable bit : Setting the CE bit to one causes the timer to begin decrementing
Interrupt Enable bit : When IE is set to one and the counter decrements to zero,
Timer interrupt bit : The timer sets this bit to one to indicate that it has decremented to
zero. this bit remain one until software sets it to zero.
Setting the CE bit to zero stops the timer.
the timer asserts its interrupt signal to interrupt CPU.
IE
2
23
3
Symbol
TICR1
TICR2
TCR1
TCR2
Access
R/W
R/W
R/W
R/W
Reserved
Read/Write
Description
Timer Control Register 1
Timer Initial Control Register 1
Timer Control Register 2
Timer Initial Control Register 2
Power-on Default : --
24
(IO base (BA) : 0xf0000000)
Pre-scale
31
W90220F
Version 0.84