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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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7<br />

LPSLRWD<br />

1-0<br />

LPSLR[1:0]<br />

15.3.2.5 Reserved Register<br />

Table 15-7. LPSLR Fields Description<br />

NOTE<br />

This reserved register is designed for factory test purposes only, and is not<br />

intended for general user access. Writing to this register when in special<br />

mode can alter the module’s functionality.<br />

Table 15-8. Reserved RegisterFields Description<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

LIN Physical Layer (S12LINPHYV1)<br />

Slew-Rate Write Disable<br />

This bit indicates that writes to the slew rate register have no effect due to synchronization. It is set after a write<br />

to the LPSLR bits, and will remain set until the LPSLR value is synchronized.<br />

1 Writes to the LPSLR bits are disabled<br />

0 Writes to the LPSLR bits are enabled<br />

Slew-Rate Bit<br />

Please see section Section 15.4.2, “Slew Rate Selection for details on how the slew rate control works.<br />

00 Normal Slew Rate (optimized for 20kBit/s).<br />

01 Slow Slew Rate (optimized for 10.4kBit/s).<br />

10 Fast Mode Slew Rate (up to 250kBit/s). This mode is not compliant with the LIN Protocol(LIN electrical<br />

characteristics like duty cycles, reference levels, etc. are not fulfilled). It is only meant to be used for fast data<br />

transmission. Please refer to section Section 15.4.2.2, “Fast Mode for more details on fast mode.Please note<br />

that an external pull-up stronger than 1kΩ might be necessary for the range 100kbit/s to 250kBit/s.<br />

11 Reserved.<br />

Please note that this register is writable only when LPSLRWD is inactive.<br />

Module Base + Address 0x0004 Access: User read/write 1<br />

7 6 5 4 3 2 1 0<br />

R<br />

W<br />

Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved<br />

Reset x x x x x x x x<br />

1 Read: Anytime<br />

Write: Only in special mode<br />

= Unimplemented<br />

Figure 15-6. Reserved Register )<br />

Field Description<br />

7-0<br />

Reserved<br />

These reserved bits are used for test purposes. Writing to these bits can alter the module functionality.<br />

<strong>Freescale</strong> <strong>Semiconductor</strong> 431

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