R01UH0823EJ0100 Rev.1.00
Page 989 of 1823
Jul 31, 2019
RX23W Group
33. Serial Communications Interface (SCIg, SCIh)
lists examples of N settings in BRR in normal asynchronous mode.
lists the maximum bit rate
settable for each operating frequency. Examples of BRR (N) settings in clock synchronous mode and simple SPI mode
are listed in
. Examples of BRR (N) settings in smart card interface mode are listed in
Examples of BRR (N) settings in simple I
2
. In smart card interface mode, the number of
base clock cycles S in a 1-bit data transfer time can be selected. For details, refer to
Sampling Timing and Reception Margin
list the maximum bit rates with external
clock input.
When either the SEMR.ABCS or BGDM bit is set to 1 in asynchronous mode, the bit rate becomes twice that listed in
. When both of those bits are set to 1, the bit rate becomes four times the listed value.
Table 33.12
Clock Source Settings
SMR.CKS[1:0] Bit Setting
Clock Source
n
0 0
PCLK
0
0 1
PCLK/4
1
1 0
PCLK/16
2
1 1
PCLK/64
3
Table 33.13
Base Clock Settings in Smart Card Interface Mode
SCMR.BCP2 Bit Setting
SMR.BCP[1:0] Bit Setting
Base Clock Cycles for 1-bit Period
S
0
0 0
93 clock cycles
93
0
0 1
128 clock cycles
128
0
1 0
186 clock cycles
186
0
1 1
512 clock cycles
512
1
0 0
32 clock cycles
32
1
0 1
64 clock cycles
64
1
1 0
372 clock cycles
372
1
1 1
256 clock cycles
256