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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
488 of 1441
NXP Semiconductors
UM10503
Chapter 20: LPC43xx/LPC43Sxx Serial GPIO (SGPIO)
At an active shift clock data is right shifted; captured data is shifted in at bit 31, and
register data is shifted out from bit 0.
20.6.5 Slice data shadow registers
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.
20.6.6 Reload registers
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).
20.6.7 Down counter registers
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 279. Slice data registers (REG[0:15], addresses 0x4010 10C0 (REG0) to 0x4010 10FC
(REG15)) 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 280. Slice data shadow registers (REG_SS[0:15], addresses 0x4010 1100 (REG_SS0) to
0x4010 113C (REG_SS15)) 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 281. Reload registers (PRESET[0:15], addresses 0x4010 1140 (PRESET0) to 0x4010
117C (PRESET15)) 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.
-
-