MM912F634CV2AP datasheet(197/335 Pages) FREESCALE

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Functional Description and Application Information

Background Debug Module (S12SBDMV1)

MM912F634

Freescale Semiconductor

197

4.30.3.2.3

BDM Program Page Index Register (BDMPPR)

Read: All modes through BDM operation when not secured

Write: All modes through BDM operation when not secured

4.30.3.3

Family ID Assignment

The family ID is a 8-bit value located in the firmware ROM (at global address: 0x3_FF0F). The read-only value is a unique family

ID which is 0xC2 for devices with HCS12S core.

4.30.4

Functional Description

The BDM receives and executes commands from a host via a single wire serial interface. There are two types of BDM commands:

hardware and firmware commands.

Hardware commands are used to read and write target system memory locations and to enter active background debug mode,

see Section 4.30.4.3, “BDM Hardware Commands"”. Target system memory includes all memory that is accessible by the CPU.

Firmware commands are used to read and write CPU resources and to exit from active background debug mode, see

Section 4.30.4.4, “Standard BDM Firmware Commands"”. The CPU resources referred to are the accumulator (D), X index

Hardware commands can be executed at any time and in any mode excluding a few exceptions as highlighted (see

Section 4.30.4.3, “BDM Hardware Commands"”), and in secure mode (see Section 4.30.4.1, “Security"”). Firmware commands

can only be executed when the system is not secure and is in active background debug mode (BDM).

Table 254. BDM Program Page Register (BDMPPR)

Address 0x3_FF08

BPAE

BPP3

BPP2

BPP1

BPP0

Reset

Table 255. BDMPPR Field Descriptions

Field

Description

BPAE

BDM Program Page Access Enable Bit

— BPAE enables program page access for BDM hardware and firmware read/write

instructions. The BDM hardware commands used to access the BDM registers (READ_BD and WRITE_BD), and can not be

used for global accesses even if the BGAE bit is set.

0 BDM Program Paging disabled

1 BDM Program Paging enabled

3–0

BPP[3:0]

BDM Program Page Index Bits 3–0

— These bits define the selected program page. For more detailed information regarding

the program page window scheme, refer to the S12S_MMC Block Guide.

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