Chapter 14 Serial Communication Interface (S12SCIV6)MC9S12ZVMB Family Reference Manual Rev. 1.3484 NXP SemiconductorsWrite: Anytime, if AMAP = 0.NOTEThose two registers are only visible in the memory map if AMAP = 0 (resetcondition).The SCI baud rate register is used by to determine the baud rate of the SCI, and to control the infraredmodulation/demodulation submodule.14.3.2.2 SCI Control Register 1 (SCICR1)Read: Anytime, if AMAP = 0.Write: Anytime, if AMAP = 0.NOTEThis register is only visible in the memory map if AMAP = 0 (resetcondition).Table 14-2. SCIBDH and SCIBDL Field DescriptionsField DescriptionSBR[15:0] SCI Baud Rate Bits — The baud rate for the SCI is determined by the bits in this register. The baud rate iscalculated two different ways depending on the state of the IREN bit.The formulas for calculating the baud rate are:When IREN = 0 then,SCI baud rate = SCI bus clock / (SBR[15:0])When IREN = 1 then,SCI baud rate = SCI bus clock / (2 x SBR[15:1])Note: The baud rate generator is disabled after reset and not started until the TE bit or the RE bit is set for thefirst time. The baud rate generator is disabled when (SBR[15:4] = 0 and IREN = 0) or (SBR[15:5] = 0 andIREN = 1).Note: . User should write SCIBD by word access. The updated SCIBD may take effect until next RT clock start,write SCIBDH or SCIBDL separately may cause baud generator load wrong data at that time,if secondwrite later then RT clock.Module Base + 0x00027 6 5 4 3 2 1 0R LOOPS SCISWAI RSRC M WAKE ILT PE PTWReset 0 0 0 0 0 0 0 0Figure 14-5. SCI Control Register 1 (SCICR1)
