S9S12G64F0MLHR Freescale Semiconductor, S9S12G64F0MLHR Datasheet - Page 683

Manufacturer Part Number

S9S12G64F0MLHR

16-bit Microcontrollers - MCU S12 Core 64kFlash Au

Manufacturer

Freescale Semiconductor

Processor Series

Data Bus Width

Maximum Clock Frequency

Program Memory Size

Data Ram Size

Operating Supply Voltage

3.13 V to 5.5 V

Operating Temperature Range

- 40 C to + 125 C

Package / Case

Mounting Style

Manufacturer

BOSTOCK HK LIMITED

Part Number:

S9S12G64F0MLHR

Manufacturer:

Freescale Semiconductor

A 13-bit modulus counter in the baud rate generator derives the baud rate for both the receiver and the

transmitter. The value from 0 to 8191 written to the SBR12:SBR0 bits determines the bus clock divisor.

The SBR bits are in the SCI baud rate registers (SCIBDH and SCIBDL). The baud rate clock is

synchronized with the bus clock and drives the receiver. The baud rate clock divided by 16 drives the

transmitter. The receiver has an acquisition rate of 16 samples per bit time.

Baud rate generation is subject to one source of error:

When IREN = 0 then,

Freescale Semiconductor

Integer division of the bus clock may not give the exact target frequency.

SCI baud rate = SCI bus clock / (16 * SCIBR[12:0])

Baud Rate Generation

lists some examples of achieving target baud rates with a bus clock frequency of 25 MHz.

Table 20-16. Baud Rates (Example: Bus Clock = 25 MHz)

MC9S12G Family Reference Manual, Rev.1.23

Serial Communication Interface (S12SCIV5)