Uart/Sio Serial Input Data Register Ch. N (Rdrn) - Fujitsu 8FX Hardware Manual

MB95630H Series
22.7.4

UART/SIO Serial Input Data Register ch. n (RDRn)

The UART/SIO serial input data register ch. n (RDRn) is used for inputting
(receiving) serial data.
■ Register Configuration
bit 7
Field RD7
Attribute R
Initial value 0
■ Register Functions
This register stores received data. The serial data signals sent to the serial data input pin (UIn)
is converted by the shift register and stored in this register.
When received data is set correctly in this register, the receive data register full flag bit
(SSRn:RDRF) is set to "1". At this time, an interrupt occurs if receive interrupt requests have
been enabled. If an RDRF bit check by the program or using an interruption shows that
received data is stored in this register, the reading of the content for this register clears the
RDRF bit to "0".
When the character bit length (SMC1n:CBL[1:0]) is set to shorter than eight bits, the excess
upper bits (beyond the set bit length) are set to "0".
MN702-00009-2v0-E
6 5
RD6 RD5
R R
0 0
FUJITSU SEMICONDUCTOR LIMITED
4 3
RD4 RD3
R R
0 0
CHAPTER 22 UART/SIO
22.7 Registers
2 1
RD2 RD1
R R
0 0
0
RD0
R
0
483