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參數資料
型號: W81C280
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: USB Keyboard/ Device Controller(具有通用串行總線接口的鍵盤/設備控制器)
中文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP40
封裝: DIP-40
文件頁數: 22/27頁
文件大小: 328K
代理商: W81C280
W81C280
Publication Release Date: July 1997
- 18 -
Revision 0.50
7. PROGRAMMING NOTES :
The W81C280 uses reserved bit of the Interrupt Enable Register IE.6 as a pre-docoding bit to
implement
a alternative register which has the same address with IP, the Interrupt Priority register. That is, for
E.6=0 (default), the IP acts normally and for IE.6=1 it cab be used for programming functions
described as below:
7.1 SET IP(INTERRUPT PRIORITY) REGISTER IN CPU CORE :
step 1 : set IE.6 = 0 (Interrupt enable bit)
step 2 : access any IP bit
7.2 SET WAKEUP AND RESUME INTERRUPTS
(for RESUME the chip )
step 1 : set IE.6 = 1
step 2 : set IP.2 = 1
7.3 THE SERIAL BUS ACCESS
P30 and P31 of the CPU core are used to access both internal serial bus and the external
serial EEPROM.
7.3.1 Access external EEPROM
step 1 : set IE.6 = 1
step 2 : set IP.3 = 1
step 3 : use the serial bus to access serial EEPROM
7.3.2 Access internal serial bus
step 1 : set IE.6 = 1
step 2 : set IP.3 = 0
step 3 : access DATA by the serial bus
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