CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
518
(c) Prescaler compare register 3 (PRSCM3)
PRSCM3 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 units.
Cautions 1. The internal timer counter is cleared by writing to the PRSM3 register. Therefore,
do not write to the PRSCM3 register during transmission.
2. Set the PRSCM3 register prior to setting the CSICAEn bit of the CSIMn register to 1.
If the contents of the PRSCM3 register are overwritten when the value of the
CSICAEn bit is 1, the cycle of the baud rate signal is not guaranteed.
7
PRSCM7
PRSCM3
6
PRSCM6
5
PRSCM5
4
PRSCM4
3
PRSCM3
2
PRSCM2
1
PRSCM1
0
PRSCM0
Address
FFFFF922H
Initial value
00H
(d) Baud rate signal cycle
The baud rate signal cycle is calculated as follows.
••••
When setting value of PRSCM3 register is 00H
(Cycle of signal selected with bits BGCS1, BGCS0 of PRSM3 register)
×
256
×
2
••••
In cases other than above
(Cycle of signal selected with bits BGCS1, BGCS0 of PRSM3 register)
×
(setting value of PRSCM3
register)
×
2
