M16C1N Datasheet, PDF (133/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
13. Serial I/O
• Example of receive timing when transfer data is 8 bits long (parity disabled, one stop bit)
BRGi count
source
"1"
Receive enable bit
"0"
RxDi
Start bit
Stop bit
D0
D1 D7
Sampled "L"
Receive data taken in
Transfer clock
Receive
complete flag
Reception triggered when transfer clock
"1" is generated by falling edge of start bit
"0"
Transferred from UARTi receive register to
UARTi receive buffer register
Receive interrupt _"1"
request bit
"0"
Cleared to "0" when interrupt request is accepted, or cleared by software
The above timing applies to the following settings:
Parity is disabled.
One stop bit.
Figure 13.13 Typical receive timing in UART mode
13.2.1 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 121 of 222
REJ09B0007-0100Z