UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
359 of 1269
NXP Semiconductors
UM10503
Chapter 18: LPC43xx Serial GPIO (SGPIO)
18.6.5 Slice data shadow registers (REG_SS0 to 15)
Each slice data shadow register contains the data for one slice: REG_SS0 to REG_SS15
contain data for slice A (register 0) to slice P (register 15).
This register controls when the shadow register REG_SS content is exchanged with the
main register REG. The exchange occurs when the POS counter reaches 0x0.
18.6.6 Reload registers (PRESET0 to 15)
Each register contains the reload value for one slice: PRESET0 to PRESET15 contain the
reload value for slice A (register 0) to slice P (register 15).
This register controls the internally generated slice shift clock frequency:
frequency(shift_clock) = frequency(SGPIO_CLK) / (1).
18.6.7 Down counter registers (COUNT0 to 15)
This status register reflect the slice shift clock counter value. If the counter has to start
with a defined phase then COUNT should be set to the desired value before the counter is
enabled using CTRL_ENABLE.
Table 218. Slice data registers (REG0 to 15, addresses 0x4010 10C0 to 0x4010 10FC) bit
description
Bit
Symbol
Description
Reset
value
Access
31:0
REG
At each active shift clock the register shifts right;
loading REG(31) with data captured from DIN(n) and
DOUT(n) is set to REG(0).
0
R/W
Table 219. Slice data shadow registers (REG_SS0 to 15, addresses 0x4010 110 to 0x4010
113C) bit description
Bit
Symbol
Description
Reset
value
Access
31:0
REG_SS Each time POS reaches 0x0 the contents of REG_SS
is exchanged with the content of REG.
0
R/W
Table 220. Reload registers (PRESET0 to 15, addresses 0x4010 1140 to 0x4010 117C) bit
description
Bit
Symbol
Description
Reset
value
Access
11:0
PRESET
Counter reload value; loaded when COUNT reaches
0x0.
0
R/W
31:12
-
Reserved.
-
-
Table 221. Down counter registers (COUNT0 to 15, addresses 0x4010 1180 to 0x4010 11BC)
bit description
Bit
Symbol
Description
Reset
value
Access
11:0
COUNT
Down counter, counts down each shift clock cycle. Next
count after 0x0 is PRESET.
0
R/W
31:12
-
Reserved.
-
-