Addendum to MC68HC908JB16 Technical Data, Rev. 1

MC68HC908JB12

Freescale Semiconductor

4

MC68HC908JB12

This section introduces the MC68HC908JB12, a derivative of the

MC68HC908JB16. The entire MC68HC908JB16 data book, including the

updates in this addendum, applies to this device, with exceptions outlined

below.

MCU Block Diagram

Figure 3 shows the structure of the MC68HC908JB12.

Memory Map

Figure 4 shows the memory map of the MC68HC908JB12.

Dual Clock

Generator Module

The dual 27-MHz clock generator module on the MC68HC908JB16 is not

designed in the MC68HC908JB12, hence, register locations from $0051 to

$0059 are unimplemented. Information in the data book relating to the CGM do

not apply to the MC68HC908JB12.

Table 1. Summary of MC68HC908JB12 and MC68HC908JB16 Differences

MC68HC908JB12

MC68HC908JB16

FLASH Memory

12,288 bytes

($CA00–$F9FF)

16,384 bytes

($BA00–$F9FF)

Dual Clock Generator Module

Not implemented.

$0051–$0059 unimplemented.

Yes

Available Packages(1)

—

28-pin SOIC

20-pin SOIC

32-pin LQFP

28-pin SOIC

20-pin SOIC

1. The pin assignments are identical for both devices; see data sheet.