MM912F634CV2AP datasheet(178/335 Pages) FREESCALE

178 / 335 page

Functional Description and Application Information

Memory Mapping Control (S12SMMCV1)

MM912F634

Freescale Semiconductor

178

4.28.2.2.3

Mode Register (MODE)

Read: Anytime.

Write: Only if a transition is allowed (see Figure 51).

The MODC bit of the MODE register is used to establish the MCU operating mode.

Figure 51. Mode Transition Diagram when MCU is Unsecured

Table 244. Mode Register (MODE)

Address: 0x0032

432

MODC

000

Reset

MODC(161)

000

Note:

161. External signal (see Table 239).

Table 245. MODE Field Descriptions

Field

Description

MODC

Mode Select Bit

— This bit controls the current operating mode during RESET high (inactive). The external mode pin MODC

determines the operating mode during RESET low (active). The state of the pin is registered into the respective register bit

after the RESET signal goes inactive (see Figure 51).

Write restrictions exist to disallow transitions between certain modes. Figure 51 illustrates all allowed mode changes.

Attempting non authorized transitions will not change the MODE bit, but it will block further writes to the register bit except in

special modes.

Changes of operating modes are not allowed when the device is secured, but it will block further writes to the register bit except

in special modes.

Normal

Single-Chip

Special

Single-Chip

RESET

(SS)

RESET

(NS)

RESET

Transition done by external pins (MODC)

Transition done by write access to the MODE register

MM912F634CV2AP Datasheet(PDF) 178 Page - Freescale Semiconductor, Inc

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