Freescale Semiconductor Tower System Eval Kit for MC9S12GN32 TWR-S12GN32-KIT TWR-S12GN32-KIT Hoja De Datos

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TWR-S12GN32-KIT

16 KByte Flash Module (S12FTMRG16K1V1)

MC9S12G Family Reference Manual, Rev.1.23

Freescale Semiconductor

783

24.3

Memory Map and Registers

This section describes the memory map and registers for the Flash module. Read data from unimplemented
memory space in the Flash module is undefined. Write access to unimplemented or reserved memory space
in the Flash module will be ignored by the Flash module.

CAUTION

Writing to the Flash registers while a Flash command is executing (that is
indicated when the value of flag CCIF reads as ’0’) is not allowed. If such
action is attempted the write operation will not change the register value.

Writing to the Flash registers is allowed when the Flash is not busy
executing commands (CCIF = 1) and during initialization right after reset,
despite the value of flag CCIF in that case (refer to

Section 24.6

for a

complete description of the reset sequence).

24.3.1

Module Memory Map

The S12 architecture places the P-Flash memory between global addresses 0x3_C000 and 0x3_FFFF as
shown in

Table 24-3

.The P-Flash memory map is shown in

Figure 24-2

Table 24-2. FTMRG Memory Map

Global Address (in Bytes)

Size