Register Descriptions
56F8322 Technical Data, Rev. 10.0
Freescale Semiconductor 83
Preliminary
6.5.4 Most Significant Half of JTAG ID (SIM_MSH_ID)
This read-only register displays the most significant half of the JTAG ID for the chip. This register reads
$01F4.
Figure 6-6 Most Significant Half of JTAG ID (SIM_MSH_ID)
6.5.5 Least Significant Half of JTAG ID (SIM_LSH_ID)
This read-only register displays the least significant half of the JTAG ID for the chip. This register reads
$001D.
Figure 6-7 Least Significant Half of JTAG ID (SIM_LSH_ID)
6.5.6 SIM Pull-up Disable Register (SIM_PUDR)
Most of the pins on the chip have on-chip pull-up resistors. Pins which can operate as GPIO can have these
resistors disabled via the GPIO function. Non-GPIO pins can have their pull-ups disabled by setting the
appropriate bit in this register. Disabling pull-ups is done on a peripheral-by-peripheral basis (for pins not
muxed with GPIO). Each bit in the register (see Figure 6-8) corresponds to a functional group of pins. See
Table 2-2 to identify which pins can deactivate the internal pull-up resistor.
Figure 6-8 SIM Pull-up Disable Register (SIM_PUDR)

6.5.6.1 Reserved—Bits 15–12

This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.

6.5.6.2 RESET—Bit 11

This bit controls the pull-up resistors on the RESET pin.
Base + $6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read 0 0 0 0 0 0 0 1 1 1 1 1 0 1 0 0
Write
RESET 0000000111110100
Base + $7 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1
Write
RESET 0000000000011101
Base + $8 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read 0
0 0 0 RESET IRQ 0 0 0 0 0 0 JTAG 0 0 0
Write
RESET 00000000 0 0000000