M16C1N Datasheet, PDF (129/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
13. Serial I/O
13.1.3 Transfer Clock Output from Multiple Pins Function (UART1)
This function allows the setting two transfer clock output pins and choosing one of the two to output a
clock by using the CLK and CLKS select bit (bits 4 and 5 at address 00B016). The multiple pins
function is valid only when the internal clock is selected for UART1.
Figure 13.10 shows the transfer clock output from the multiple pins function usage.
Microcomputer
TXD1 (P37)
CLKS (P34)
CLK1 (P36)
IN
CLK
IN
CLK
Note 1: This applies when the internal clock is selected and transmission
is performed only in clock synchronous serial I/O mode.
Figure 13.10 The transfer clock output from the multiple pins function usage
13.1.4 Continuous Receive Mode
If the continuous receive mode enable bit (bits 2 and 3 at address 00B016) is set to "1", the unit is
placed in continuous receive mode. In this mode, when the receive buffer register is read out, the unit
simultaneously goes to a receive enable state without having to set dummy data to the transmit buffer
register back again.
13.1.5 RxD1 Input Pin Selection Function (UART1)
This function allows the setting two RxD1 input pins and choosing one of the two to input serial data by
using the RxD1 input pin select bit (bits 6 at address 00B016).
When selecting "1" (P35) for RxD1 input pin select bit, P37 functions as TxD1 output pin. When select-
ing "0" (P37), serial data output cannot be performed. However, P35 can be used as an input/output
port.
Rev.1.00 Oct 20, 2004 page 117 of 222
REJ09B0007-0100Z