MAC7200 datasheet(712/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

634

Freescale Semiconductor

NOTE

Registers which belong to the same 32-bit word can be accessed together

with one 32-bit access - registers which belong to the same 16-bit word can

be accessed together with one 16-bit access. (E.g. SCIDRH/L can be

accessed with 16-bit reads and 16-bit writes.)

31.9.2

This section consists of register descriptions in address order. Each description includes a standard register

diagram with an associated figure number. Writes to a reserved register location do not have any effect and

reads of these locations return a zero. Details of register bit and field function follow the register diagrams,

in bit order.

NOTE

Before accessing the registers the module must be enabled by writing the

MDIS bit in the SCI control register 3.

31.9.2.1

SCI Baud Rate Registers

The SCI Baud Rate Register is used to select the baud rate of the SCI. The formula for calculating the baud

rate is:

SCI baud rate = SCI module clock / (16 x BR),

where BR is the content of the SCI baud rate registers, bits SBR12 through SBR0. The baud rate registers

can contain a value from 1 to 8191.

Read: anytime. If only SCIBDH is written to, a read will not return the correct data until SCIBDL is written

to as well, following a write to SCIBDH.

Write: anytime

LINCRCP2

(bit 23-16)

Read:

0x19

Write:

Address Offset: 0x0

Access: User read/write

765

43210

000

SBR12

SBR11

SBR10

SBR9

SBR8

Reset

00000000

Figure 31-2. SCI Baud Rate Register High (SCIBDH)

Table 31-4. eSCI Register Quick Reference (Continued)

Bit 7

4321

Bit 0

Addr. offset

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