upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 307

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

10.4.4 Standby function
(1) Operation in HALT mode
(2) Operation in IDLE and software STOP modes
Only serial transfer operations are performed normally.
(a) When internal clock is selected as serial clock
(b) When external clock is selected as serial clock
The operations of asynchronous serial interface mode register n (ASIMn), asynchronous serial status register
n (ASISn), baud rate generator control register n (BRGCn), baud rage generator mode control registers n and
01 (BRGMCn, BRGMC01), transmit shift register n (TXSn), and receive buffer register n (RXBn) are stopped
and their values immediately before the clock stopped are held.
The TXDn pin output holds the data immediately before the clock was stopped (in software STOP mode)
during transmission. When the clock is stopped during reception, the receive data until the clock stopped is
stored and subsequent receive operations are stopped. Reception resumes upon clock restart.
Only serial transfer operations are performed normally.
CHAPTER 10
User’s Manual U12768EJ4V1UD
SERIAL INTERFACE FUNCTION
307