MC68HC901P MOTOROLA [Motorola, Inc], MC68HC901P Datasheet - Page 49

• Manufacturer Part Number: MC68HC901P
• Description: Multi-Function Peripheral
• Manufacturer: MOTOROLA [Motorola, Inc]

Universal Synchronous/Asynchronous Receiver-Transmitter
PE— Parity Error
FE — Frame Error
A frame error exists when a non-zero data character is not followed by a stop bit in the
asynchronous character format.
F/S or B — Found/Search or Break Detect
The F/S bit is used in the synchronous character format. When set to zero, the USART
receiver is placed in the search mode. F/S is cleared when the incoming character does not
match the synchronous character.
The B bit is used in the asynchronous character format. this flag indicates a break condition
which continues until a non-zero data bit is received.
M or CIP — Match/Character in Progress
The M bit is used in the synchronous character format and indicates a synchronous
character has been received.
The CIP bit is used in the asynchronous character format and indicates that a character is
being assembled.
SS — Synchronous Strip Enable
7-6
1 = Receiver buffer full and incoming word received.
0 = Read by RSR.
1 = Parity error detected on character transfer to receiver buffer.
0 = No parity error detected on character transfer to receiver buffer.
1 = Frame error detected on character transfer to receiver buffer.
0 = No frame error detected on character transfer to receiver buffer.
1 = Match found. Character length counter enabled.
0 = Incoming data compared to SCR. Character length counter disabled.
1 = Character transferred to the receive buffer is a break condition.
0 = Non-zero data bit received and break condition was acknowledged by reading the
1 = Character transferred to the receive buffer matches the synchronous character.
0 = Character transferred to the receive buffer does not match the synchronous
1 = Start bit is detected.
0 = Final stop bit has been received.
1 = Characters that match the synchronous character will not be loaded into the
0 = Characters that match the synchronous character will be transferred to the receive
RSR at least once.
character.
receiver buffer and no buffer full condition will be produced.
buffer and a buffer full condition will be produced.
MC68HC901 USER’S MANUAL
MOTOROLA