18 UART
S1C17001 TECHNICAL MANUAL
EPSON
227
0x4102: UART Receive Data Register (UART_RXD)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
UART Receive
Data Register
(UART_RXD)
0x4102
(8 bits)
D7–0
RXD[7:0]
Receive data in the receive data
buffer
RXD7(6) = MSB
RXD0 = LSB
0x0 to 0xff (0x7f)
0x0
R
Older data in the
buffer is read out
first.
D[7:0] RXD[7:0]:
Receive
Data
Data in the receive data buffer is read out in sequence, starting with the oldest. Received data is placed
in the receive data buffer. The receive data buffer is a 2-byte FIFO that allows proper data receipt until
it fills, even if data is not read out. If the buffer is full and the shift register also contains received data,
an overrun error will occur, unless the data is read out before receipt of the subsequent data starts.
The receive circuit includes two receive buffer status flags: RDRY (D1/UART_ST register) and RD2B
(D3/UART_ST register). The RDRY flag indicates the presence of valid received data in the receive
data buffer, while RD2B flag indicates the presence of two items of received data in the receive data
buffer.
A receive buffer full interrupt occurs when the received data in the receive data buffer reaches the num-
ber specified by RBFI (D1/UART_CTL register).
0 is loaded into RXD7 in 7-bit mode.
Serial data input via the SIN pin is converted to parallel, with the initial bit as LSB, the High level bit as 1,
and the Low level bit as 0. This data is then loaded into the receive data buffer.
This register is read-only. (Default: 0x0)
Summary of Contents for S1C17001
Page 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
Page 33: ...4 POWER SUPPLY VOLTAGE 24 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 63: ...6 INITERRUPT CONTROLLER 54 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 87: ...8 CLOCK GENERATOR CLG 78 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 91: ...9 PRESCALER PSC 82 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 133: ...11 16 BIT TIMER T16 124 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 211: ...16 STOPWATCH TIMER SWT 202 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 219: ...17 WATCHDOG TIMER WDT 210 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 241: ...18 UART 232 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 277: ...20 I2 C 268 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 313: ...25 PACKAGE 304 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...