Renesas H8S/2158 User Manual page 467

Bit Bit Name Initial Value
7 SSE 0
6, 5 — All 0
4 ABCS 0
Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
R/W Description
R/W SCI Select Enable
Enables/disables the external pins to select the SCI
functions when the external clock is supplied in
clocked synchronous mode.
0: Disables the external pins to select the SCI
functions (normal)
1: Enables the external pins to select the SCI
functions
•
SCI_0
SSE0I pin input = 0 (selected state): SCI_0
operates normally
SSE0I pin input = 1 (non-selected state): SCI_0
halts operation
(TxD0 = high-impedance state, SCK0 = fixed to
high)
•
SCI_2
SSE2I pin input = 0 (selected state): SCI_2
operates normally
SSE2I pin input = 1 (non-selected state): SCI_2
halts operation
(TxD2 = high-impedance state, SCK2 = fixed to
high)
R Reserved
These bits are always read as 0 and cannot be
modified.
R/W Asynchronous Mode Basic Clock Select
Specifies the basic clock for a 1-bit cycle in
asynchronous mode.
This bit is valid only in asynchronous mode (C/A bit in
SMR is 0).
0: The basic clock has a frequency 16 times the
transfer clock frequency (normal operation)
1: The basic clock has a frequency 8 times the
transfer clock frequency (double-speed operation)
Rev. 3.00 Jan 25, 2006 page 413 of 872
REJ09B0286-0300