APPLICATION NOTE
R01AN3634EJ0100 Rev.1.00 Page 1 of 85
Feb. 15, 2017
RL78/G11
UART Reception in STOP Mode Using
Middle-speed On-chip Oscillator IAR
Introduction
This application note explains how to receive data in UART communication during STOP mode using the RL78/G11
middle-speed on-chip oscillator. STOP mode is released when the INTP (external interrupt) pin detects the start bit.
Operations return from STOP mode and UART data is received simultaneously.
The middle-speed on-chip oscillator does not provide frequency accurate enough for UART communications and
baud rate corrections are necessary. A detailed description on how to correct the baud rate is provided in the following
document: “RL78/G11 UART communication with middle speed on chip oscillator IAR (R01AN3621EJ).”
Target Device
RL78/G11
When applying this application note to other microcomputers, please change it according to the corresponding
specification and evaluate thoroughly before using.
R01AN3634EJ0100
Rev.1.00
Feb. 15, 2017
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