Toshiba TMP92CM22FG TLCS-900/H1 Series Manual page 147

3.9.2 Operation of Each Circuit
(1) Prescaler
There is a 6-bit prescaler for generating a clock to SIO0. The clock selected using
SYSCR1<GEAR2:0> is divided by 8 and input to the prescaler as φT0. The prescaler
can be run only case of selecting the baud rate generator as the serial transfer clock.
Table 3.9.2 shows prescaler clock resolution into the baud rate generator.
Table 3.9.2 Prescaler Clock Resolution to Baud Rate Generator
Clock Gear
−
SYSCR1
<GEAR2:0>
000(1/1)
001(1/2)
fc
010(1/4)
011(1/8)
100(1/16)
The serial interface baud rate generator selects between 4 clock inputs: φT0, φT2,
φT8, and φT32 among the prescaler outputs.
Clock Resolution
−
BR0CR<BR0CK1:0>
φT0 φT2
fc/8 fc/32
fc/16 fc/64
1/8
fc/32 fc/128
fc/64 fc/256
fc/128 fc/512
92CM22-145
TMP92CM22
φT8 φT32
fc/128 fc/512
fc/256 fc/1024
fc/512 fc/2048
fc/1024 fc/4096
fc/2048 fc/8192
2007-02-16