W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 56

• 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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Bits 1-7 Time Out counter (TOUTcnt[0:6] ) comparsion value
If "TOUTen" is set, the "TOUTcnt[0:6] will be reset first and then start counting whenever
a new PPI transfer cycle is initiated. On detecting TOUTcnt[0:6] is equal to TOUTcmp[1:7],
a "Time Out" flag will be set which in turn trigger a interrupt request (Irpt_TOUT) if IER[2]
The tick of Time-Out Counter is about 9.175ms (OSC/(2**21) where OSC = 14.318Mhz).
The maximum duration that Time-Out Counter can cover is about 1.17 sec (2**7 ticks).
5.2.5
W90220 Provides 2 COM ports to interface external RS232 devices. COM1 allocates 0xf00003f8
~ oxf00003ff as its IO-space, while COM2 allocates 0xf00002f8 ~ 0xf00002ff as its IO-space.
Table 5.2.5-1 : COM1 Register Map
(ToutIen) is also set at that time.
BA + 0x3f8,
BA + 0x3f8,
BA + 0x3f9,
BA + 0x3f8,
BA + 0x3f9,
BA + 0x3fa
Port Addr.
DLAB = 0
DLAB = 0
DLAB = 1
DLAB = 1
DLAB = 1
COM PORT INTERFACE REGISTERS
0 = Disable Time Out counter
1 = Enable Time Out counter
DLM[0:7]
RBR[0:7]
THR[0:7]
DLL[0:7]
IER[3:7]
IIR[0:7]
Symbol
Access
R/W
R/W
R/W
W
R
R
Description
Receiver Buffer Register
Transmitter Holding Register
Interrupt Enable Register
Divisor Latch Register (LS)
Divisor Latch Register (MS)
Interrupt Identification Register
(IO base (BA) : 0xf0000000)
W90220F
Version 0.84