MC9S12HY64 Datasheet, PDF (138/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

S12P Memory Map Control (S12PMMCV1)
Address
0x000B
0x0011
0x0015
Register
Name
MODE
DIRECT
PPAGE
Bit 7
6
5
4
3
R
0
0
0
0
MODC
W
R
DP15
W
DP14
DP13
DP12
DP11
R
0
0
0
0
PIX3
W
= Unimplemented or Reserved
Figure 3-2. MMC Register Summary
2
0
DP10
PIX2
1
0
DP9
PIX1
Bit 0
0
DP8
PIX0
3.3.2 Register Descriptions
This section consists of the S12PMMC control register descriptions in address order.
3.3.2.1 Mode Register (MODE)
Address: 0x000B
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
MODC
W
Reset MODC¹
0
0
0
0
0
0
0
1. External signal (see Table 3-3).
= Unimplemented or Reserved
Figure 3-3. Mode Register (MODE)
Read: Anytime.
Write: Only if a transition is allowed (see Figure 3-4).
The MODC bit of the MODE register is used to select the MCU’s operating mode.
Table 3-4. MODE Field Descriptions
Field
7
MODC
Description
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 3-4).
Write restrictions exist to disallow transitions between certain modes. Figure 3-4 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.
Write accesses to the MODE register are blocked when the device is secured.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
138
Freescale Semiconductor