PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

REGISTER 10-1:

TRISE REGISTER (40/44-PIN DEVICES ONLY)

R-0

R-0

R/W-0

R/W-0

U-0

IBF

OBF

IBOV PSPMODE —

bit 7

R/W-1

TRISE2

R/W-1

TRISE1

R/W-1

TRISE0

bit 0

bit 7

IBF: Input Buffer Full Status bit

1 = A word has been received and waiting to be read by the CPU

0 = No word has been received

bit 6

OBF: Output Buffer Full Status bit

1 = The output buffer still holds a previously written word

0 = The output buffer has been read

bit 5

IBOV: Input Buffer Overflow Detect bit (in Microprocessor mode)

1 = A write occurred when a previously input word has not been read (must be cleared in software)

0 = No overflow occurred

bit 4

PSPMODE: Parallel Slave Port Mode Select bit

1 = Parallel Slave Port mode

0 = General purpose I/O mode

bit 3

Unimplemented: Read as ‘0’

bit 2

TRISE2: RE2 Direction Control bit

1 = Input

0 = Output

bit 1

TRISE1: RE1 Direction Control bit

1 = Input

0 = Output

bit 0

TRISE0: RE0 Direction Control bit

1 = Input

0 = Output

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

DS39631A-page 118

Preliminary

 2004 Microchip Technology Inc.

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