參數(shù)資料
型號(hào)： W77LE58P-25
廠商： WINBOND ELECTRONICS CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8 BIT MICROCONTROLLER
中文描述： 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 23/81頁(yè)
文件大?。?/td> 657K
代理商： W77LE58P-25
Preliminary W77LE58
Publication Release Date: August 1999
- 23 - Revision A1
Status Register
Bit:
7
6
5
4
3
2
1
0
-
HIP
LIP
XTUP
SPTA1
SPRA1
SPTA0
SPRA0
Mnemonic: STATUS
Address: C5h
HIP: High Priority Interrupt Status. When set, it indicates that software is servicing a high priority
interrupt. This bit will be cleared when the program executes the corresponding RETI
instruction.
LIP: Low Priority Interrupt Status. When set, it indicates that software is servicing a low priority
interrupt. This bit will be cleared when the program executes the corresponding RETI
instruction.
XTUP:Crystal Oscillator Warm-up Status. when set, this bit indicates CPU has detected clock to be
ready. Each time the crystal oscillator is restarted by exit from power down mode or the XTOFF
bit is set, hardware will clear this bit. This bit is set to 1 after a power-on reset. When this bit is
cleared, it prevents software from setting the XT/RG bit to enable CPU operation from crystal
oscillator.
SPTA1:Serial Port 1 Transmit Activity. This bit is set during serial port 1 is currently transmitting data.
It is cleared when TI_1 bit is set by hardware. Changing the Clock Divide Control bits
CD0, CD1 will be ignored when this bit is set to 1 and SWB = 1.
SPRA1:Serial Port 1 Receive Activity. This bit is set during serial port 1 is currently receiving a data.
It is cleared when RI_1 bit is set by hardware. Changing the Clock Divide Control bits CD0,
CD1 will be ignored when this bit is set to 1 and SWB = 1.
SPTA0:Serial Port 0 Transmit Activity. This bit is set during serial port 0 is currently transmitting data.
It is cleared when TI bit is set by hardware. Changing the Clock Divide Control bits CD0,CD1
will be ignored when this bit is set to 1 and SWB = 1.
SPRA0:Serial Port 0 Receive Activity. This bit is set during serial port 0 is currently receiving a data.
It is cleared when RI bit is set by hardware. Changing the Clock Divide Control bits CD0,CD1
will be ignored when this bit is set to 1 and SWB = 1.
Timed Access
Bit:
7
6
5
4
3
2
1
0
TA.7
TA.6
TA.5
TA.4
TA.3
TA.2
TA.1
TA.0
Mnemonic: TA
Address: C7h
TA: The Timed Access register controls the access to protected bits. To access protected bits, the
user must first write AAH to the TA. This must be immediately followed by a write of 55H to TA.
Now a window is opened in the protected bits for three machine cycles, during which the user
can write to these bits.
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