F21 datasheet(249/416 Pages) MICROCHIP

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DS30010118D-page 249

PIC24FJ256GA705 FAMILY

PMSTAT: EPMP STATUS REGISTER (SLAVE MODE ONLY)

HSC/R-0

HS/R/W-0

U-0

HSC/R-0

IBF

IBOV

—

—IB3F(1)

IB2F(1)

IB1F(1)

IB0F(1)

bit 15

bit 8

HSC/R-1

HS/R/W-0

U-0

HSC/R-1

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

IB3F:IB0F: Input Buffer x Status Full bits(1)

1 = Input buffer contains unread data (reading the 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 Buffer register (must be cleared in software)

0 = No underflow occurred

bit 5-4

Unimplemented: Read as ‘0’

bit 3-0

OB3E:OB0E: Output Buffer x Status Empty bits

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

0 = Output Buffer x 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) get cleared, even on byte reading.

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