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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
355 of 1269
NXP Semiconductors
UM10503
Chapter 18: LPC43xx Serial GPIO (SGPIO)
18.6.2 SGPIO multiplexer configuration registers (SGPIO_MUX_CFG0 to 15)
Each register controls one SGPIO multiplexer to select the following sources:
•
External clock source (when COUNT is not used)
•
External clock qualifier (static or controlled by a slice or external pin)
•
Input concatenation structure
SGPIO_MUX_CFG0 to SGPIO_MUX_CFG15 control slices A (register 0) to P (register
15).
To avoid oscillation, slices that can be a clock source for other slices cannot support
external slice clocks themselves (CLK_SOURCE_SLICE_MODE). These slices should
not feed a clock higher than SGPIO_CLOCK/2 to the other slices.
Fig 35. SGPIO local output pin multiplexer configuration
p_out_c fg
dout _doutm1
dout _doutm2
dout _doutm4
dout _doutm8
GP IO_RE G
c lk_out
p_oe_c fg
GP IO _OE RE G
dout_oem2
dout_oem4
dout_oem8
OUT_MUX _CFGx
doe
dout
5:4
3:0
dout_oem1
00
01
10
11
0000
00x x
01x x
10x x
0100
1000
11x x
p_oe_c fg
6
0
1
res erv ed
Table 215. SGPIO multiplexer configuration registers (SGPIO_MUX_CFG0 to 15, addresses
0x4010 0040 to 0x4010 007C) bit description
Bit
Symbol
Value Description
Reset
value
Access
0
EXT_CLK_ENABLE
Select clock signal.
0
R/W
0x0
Internal clock signal (slice)
0x1
External clock signal (pin)