r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 461

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
22. Serial Interface (UARTi (i = 0 or 1))
The serial interface consists of three channels, UART0 to UART2. This chapter describes the UARTi (i = 0 or 1).
22.1
Figure 22.1
UARTi
RXDi
CLKi
UART0 and UART 1 have a dedicated timer to generate a transfer clock and operate independently. UART0 and
UART1 support clock synchronous serial I/O mode and clock asynchronous serial I/O mode (UART mode).
Figure 22.1 shows a UARTi (i = 0 or 1) Block Diagram. Figure 22.2 shows a Block Diagram of UARTi
Transmit/Receive Unit. Table 22.1 lists the Pin Configuration of UARTi (i = 0 or 1).
CLK1 and CLK0 = 00b
f32
fC
f1
f8
Overview
= 01b
= 10b
= 11b
polarity
switch
circuit
CLK
UARTi (i = 0 or 1) Block Diagram
Clock synchronous type
(internal clock selected)
CKDIR = 0
Internal
External
CKDIR = 1
UiBRG register
1/(n0+1)
1/16
1/16
1/2
Clock synchronous type
Clock synchronous type
Clock synchronous type
(internal clock selected)
Clock synchronous type
(external clock selected)
UART reception
UART transmission
Reception control
Transmission
control circuit
CKDIR = 0
CKDIR = 1
circuit
22. Serial Interface (UARTi (i = 0 or 1))
CKDIR: Bit in UiMR register
CLK0, CLK1: Bits in UiC0 register
i = 0 or 1
Receive clock
Transmit clock
Transmit/
receive
unit
Page 429 of 740
TXDi