Lucent Technologies MN10285K - Manual (Page 143)

Serial Interfaces
Serial Interface Control Registers
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
142
Panasonic
SC0STR/SC1STR: Serial Port n Status Register x’00FD83’/x’00FD8B’
SCnSTR contains the error detection and status flags for the serial inter-
faces.
SCnTBY: Serial port n transmission busy flag
0: OK to transmit
1: Transmission in progress
SCnRBY: Serial port n reception busy flag
0: OK to receive
1: Reception in progress
SCnISP: Serial port n I
2
C stop sequence detect
A read or write to SCnTRB clears this bit.
0: No stop sequence
1: Stop sequence detected
SCnRXA: Serial port n received data flag
0: Not received
1: Received
SCnIST: Serial port n I 2 C start sequence detect
A read or write to SCnTRB clears this bit.
0: No start sequence
1: Start sequence detected
SCnFE: Serial port n framing error
A framing error occurs when a 0 is received during stop bit transfer. Fram-
ing error data is updated each time the stop bit is received.
0: No error
1: Framing error occurred
SCnPE: Serial port n parity error
A parity error occurs when the received parity bit is 1 and the parity setting
is 0; when the received parity bit is 0 and the parity setting is 1; when the
received parity bit is odd and the parity setting is even; or when the
received parity bit is even and the parity setting is odd. Parity error data is
updated each time the parity bit is received.
0: No error
1: Parity error occurred
SCnOE: Serial port n overrun error
An overrun error occurs during reception when a data byte reception ends
before the CPU has read the previous byte from SCnTRB. Overrun error
data is updated each time the last data bit (seventh or eighth bit) is received.
0: No error
1: Overrun error occurred
Bit: 7 6 5 4 3 2 1 0
SCn
TBY
SCn
RBY
SCn
ISP
SCn
RXA
SCn
IST
SCn
FE
SCn
PE
SCn
OE
Reset: 0 0 0 0 0 0 0 0
R/W: R R R R R R R R