Datasheet

PIC24FJ256DA210 FAMILY

DS39969B-page 282  2010 Microchip Technology Inc.

R-0, HSC R/W-0 HS U-0 U-0 R-0, HSC R-0, HSC R-0, HSC R-0, HSC

IBF IBOV

— — IB3F IB2F IB1F IB0F

bit 15 bit 8

R-1, HSC R/W-0 HS U-0 U-0 R-1, HSC R-1, HSC R-1, HSC R-1, HSC

OBE OBUF

— — OB3E OB2E OB1E OB0E

bit 7 bit 0

Legend: HS = Hardware Settable bit HSC = Hardware Settable/Clearable bit

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 15 IBF: Input Buffer Full Status bit

1 = All writable input buffer registers are full

0 = Some or all of the writable input buffer registers are empty

bit 14 IBOV: Input Buffer Overflow Status bit

1 = A write attempt to a full input register occurred (must be cleared in software)

0 = No overflow occurred

bit 13-12 Unimplemented: Read as ‘0’

bit 11-8 IBxF: Input Buffer x Status Full bit

(1)

1 = Input buffer contains unread data (reading buffer will clear this bit)

0 = Input buffer does not contain unread data

bit 7 OBE: Output Buffer Empty Status bit

1 = All readable output buffer registers are empty

0 = Some or all of the readable output buffer registers are full

bit 6 OBUF: Output Buffer Underflow Status bit

1 = A read occurred from an empty output register (must be cleared in software)

0 = No underflow occurred

bit 5-4 Unimplemented: Read as ‘0’

bit 3-0 OBxE: Output Buffer x Status Empty bit

1 = Output buffer is empty (writing data to the buffer will clear this bit)

0 = Output buffer contains untransmitted data

Note 1: Even though an individual bit represents the byte in the buffer, the bits corresponding to the Word (byte 0

and 1, or byte 2 and 3) gets cleared even on byte reading.