Freescale Semiconductor KIT912F634EVME Evaluation Kit KIT912F634EVME KIT912F634EVME Datenbogen
Produktcode
KIT912F634EVME
Functional Description and Application Information Memory
Mapping Control (S12SMMCV1)
MM912F634
Freescale Semiconductor
181
4.28.2.2.3
Mode Register (MODE)
Read: Anytime.
Write: Only if a transition is allowed (see
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
7
6
5
4
3
2
1
0
R
MODC
0
0
0
0
0
0
0
W
Reset
MODC
0
0
0
0
0
0
0
Note:
171. External signal (see
).
Table 245. MODE Field Descriptions
Field
Description
7
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
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
).
Write restrictions exist to disallow transitions between certain modes.
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.
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
1
Special
Single-Chip
0
RESET
(SS)
0
RESET
1
(NS)
RESET
Transition done by external pins (MODC)
Transition done by write access to the MODE register
1