hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 384

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 Serial Communication Interface
Bit 4—Receive Enable (RE)
Bit 4 selects enabling or disabling of the start of receive operation.
Bit 4
RE
0
1
Notes: 1. Note that the RDRF, FER, PER, and OER flags in SSR are not affected when bit RE is
Bit 3—Multiprocessor Interrupt Enable (MPIE)
Bit 3 selects enabling or disabling of the multiprocessor interrupt request. The MPIE bit setting is
only valid when asynchronous mode is selected and reception is carried out with bit MP in SMR
set to 1. The MPIE bit setting is invalid when bit COM is set to 1 or bit MP is cleared to 0.
Bit 3
MPIE
0
1
Note: * Receive data transfer from RSR to RDR, receive error detection, and setting of the RDRF,
Rev. 7.00 Mar 10, 2005 page 342 of 652
REJ09B0042-0700
2. In this state, serial data reception is started when a start bit is detected in asynchronous
FER, and OER status flags in SSR is not performed. RXI, ERI, and setting of the RDRF,
FER, and OER flags in SSR, are disabled until data with the multiprocessor bit set to 1 is
received. When a receive character with the multiprocessor bit set to 1 is received, bit
MPBR in SSR is set to 1, bit MPIE is automatically cleared to 0, and RXI and ERI requests
(when bits TIE and RIE in serial control register 3 (SCR3) are set to 1) and setting of the
RDRF, FER, and OER flags are enabled.
cleared to 0, and retain their previous state.
mode or serial clock input is detected in synchronous mode. Be sure to carry out serial
mode register (SMR) settings to decide the reception format before setting bit RE to 1.
Description
Receive operation disabled *
Receive operation enabled *
Description
Multiprocessor interrupt request disabled (normal receive operation)
Clearing condition:
When data is received in which the multiprocessor bit is set to 1
Multiprocessor interrupt request enabled *
2
1
(RXD32 pin is receive data pin)
(RXD32 pin is I/O port)
(initial value)
(initial value)