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TMP92CM22
2007-02-16
92CM22-145
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 Resolution
BR0CR<BR0CK1:0>
−
Clock Gear
SYSCR1
<GEAR2:0>
−
φT0 φT2 φT8 φT32
000(1/1) fc/8 fc/32 fc/128 fc/512
001(1/2) fc/16
fc/64 fc/256 fc/1024
010(1/4) fc/32
fc/128 fc/512 fc/2048
011(1/8)
fc/64
fc/256 fc/1024 fc/4096
fc
100(1/16)
1/8
fc/128 fc/512 fc/2048 fc/8192
The serial interface baud rate generator selects between 4 clock inputs: φT0, φT2,
φT8, and φT32 among the prescaler outputs.