Toshiba TLCS-900/L1 Series Manual page 141

7
−
BR1CR Bit symbol
(020BH)
Read/Write
After reset 0
Function Always
write 0
+ (16 − K)/16 division enable
0 Disabled
1 Enabled
7
BR1ADD Bit symbol
(020CH)
Read/Write
After reset
Function
Baud rate generator frequency divisor setting
BR0CR
<BR1S3:0>
BR1ADD
<BR1K3:0>
0000
0001 (K = 1)
to
1111 (K = 15)
Note1: Availability of +(16-K)/16 division function
N
2 to 15
1, 16
The baud rate generator can be set "1" in UART mode and disable +(16-K)/16 division function.Don't use in
I/O interface mode.
Note2: Set BR1CR <BR1ADDE> to 1 after setting K (K = 1 to 15) to BR1ADD<BR1K3:0> when +(16-K)/16 division
function is used. Writes to unused bits in the BR0ADD register do not affext operation, and undefined data is
read from these unused bits.
Figure 3.9.12 Baud Rate Generator Control (SIO1, BR1CR, BR1ADD)
6 5 4
BR1ADDE BR1CK1 BR1CK0
0 0 0
00: φT0
+ (16 − K)/16
01: φT2
division
10: φT8
0: Disable
11: φT32
1: Enable
Input clock selection for baud rate generator
Internal clock φT0
00
Internal clock φT2
01
Internal clock φT8
10
Internal clock φT32
11
6 5 4
BR1CR<BR1ADDE> = 1
0000 (N = 16) 0010 (N = 2)
or to
0001 (N = 1) 1111 (N = 15)
Disable Disable
Disable Disabled by
N + (16 − K)/16
UART Mode I/O Mode
○
×
× ×
91C824-139
3 2
BR1S3 BR1S2 BR1S1
R/W
0 0
Setting the divided frequency "N"
(0 to F)
3 2
BR1K3 BR1K2 BR1K1
R/W
0 0
Sets the frequency divisor "K"
(Divided by N + (16 − K)/16)
BR1CR<BR1ADDE> = 0
0001 (N = 1) (UART only)
to
1111 (N = 15)
0000 (N = 16)
Divided by N
TMP91C824
1 0
BR1S0
0 0
1 0
BR1K0
0 0
2008-02-20