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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(c) Prescaler compare registers 0, 1 (PRSCM0, PRSCM1)
PRSCMn is an 8-bit compare register that sets the value of the 8-bit timer counter.
This register can be read/written in 8-bit or 1-bit units (n = 0 to 2).
Figure 13-44:
Prescaler Compare Registers 0, 1 (PRSCM0, PRSCM1)
Cautions: 1. The internal timer counter is cleared by writing to the PRSMn register. Therefore,
do not write to the PRSCMn register during transmission.
2. Set the PRSCMn register prior to setting the CE bit of the PRSMn register to 1. If
the contents of the PRSCMn register are overwritten when the value of the CE bit
is 1, the cycle of the baud rate signal is not guaranteed.
(d) Baud rate signal cycle
The baud rate signal cycle is calculated as follows.
• When setting value of PRSCMn register is 00H
(Cycle of signal selected with bits BGCS1, BGCS0 of PRSMn register) / 256 × 2
• In cases other than above
(Cycle of signal selected with bits BGCS1, BGCS2 of PRSMn register) / (setting value of PRSCMn
register) × 2.
7
6
5
4
3
2
1
0
Address
Initial
value
PRSCM0
PRSCM7
PRSCM6
PRSCM5
PRSCM4
PRSCM3
PRSCM2
PRSCM1
PRSCM0
FFFF FDC1H
00H
7
6
5
4
3
2
1
0
Address
Initial
value
PRSCM1
PRSCM7
PRSCM6
PRSCM5
PRSCM4
PRSCM3
PRSCM2
PRSCM1
PRSCM0
FFFF FDE1H
00H
Bit Position
Bit Name
Function
7 to 0
PRSCM7 to
PRSCM0
Compare value of the 8-bit timer counter.
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