hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 396

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 Serial Communication Interface
After setting bits CKE1 and CKE0, set the operating mode in the serial mode register (SMR).
For details on clock source selection, see table 10.12 in 10.3.3,1, Overview.
Bit 1
CKE1
0
0
1
1
Notes: 1. Initial value
7. Serial Status Register (SSR)
SSR is an 8-bit register containing status flags that indicate the operational status of SCI3, and
multiprocessor bits.
SSR can be read or written by the CPU at any time, but only a write of 1 is possible to bits TDRE,
RDRF, OER, PER, and FER. In order to clear these bits by writing 0, 1 must first be read.
Bits TEND and MPBR are read-only bits, and cannot be modified.
SSR is initialized to H'84 upon reset, and in standby, module standby, or watch mode.
Rev. 6.00 Aug 04, 2006 page 360 of 680
REJ09B0145-0600
Bit
Initial value
Read/Write
Note: *
2. A clock with the same frequency as the bit rate is output.
3. Input a clock with a frequency 16 times the bit rate.
Bit 0
CKE0
0
1
0
1
Only a write of 0 for flag clearing is possible.
TDRE
R/(W)
7
1
Description
Communication Mode
Asynchronous
Synchronous
Asynchronous
Synchronous
Asynchronous
Synchronous
Asynchronous
Synchronous
*
RDRF
R/(W)
6
0
*
R/(W)
OER
5
0
*
R/(W)
FER
4
0
Clock Source
Internal clock
Internal clock
Internal clock
Reserved
External clock
External clock
Reserved
Reserved
*
R/(W)
PER
3
0
*
TEND
R
2
1
SCK
I/O port *
Serial clock output *
Clock output *
Clock input *
Serial clock input
3X
MPBR
Pin Function
R
1
0
1
3
2
MPBT
R/W
0
0
1