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參數(shù)資料
型號(hào): W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結(jié)構(gòu)的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結(jié)構(gòu)的32位嵌入式微控制器)
文件頁數(shù): 116/174頁
文件大小: 2102K
代理商: W90221F
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The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
116
Versi on 0. 4, March/2000
0
1
2
3
4
5
6
7
TOUTen
TOUTcmp
Bits 0 Time Out Counter enable
0 = Disable Time Out counter
1 = Enable Time Out counter
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]
(ToutIen) is also set at that time.
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).
6.7 COM PORT INTERFACE REGISTERS
W90221 Provides 2 COM ports to interface external RS232 devices. COM0 allocates 0xf00003f8
~ oxf00003ff as its IO-space, while COM1 allocates 0xf00002f8 ~ 0xf00002ff as its IO-space.
Table 6.7-1 : COM0 Register Map
(IO base (BA) : 0xf0000000)
Port Addr.
Symbol
Access
Description
BA + 0x3f8,
DLAB = 0
RBR[0:7]
R
Receiver Buffer Register
BA + 0x3f8,
DLAB = 0
THR[0:7]
W
Transmitter Holding Register
BA + 0x3f9,
DLAB = 1
IER[3:7]
R/W
Interrupt Enable Register
BA + 0x3f8,
DLAB = 1
DLL[0:7]
R/W
Divisor Latch Register (LS)
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