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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
491 of 1441
NXP Semiconductors
UM10503
Chapter 20: LPC43xx/LPC43Sxx Serial GPIO (SGPIO)
20.6.15 GPIO output enable register
20.6.16 Slice count enable register
20.6.17 Slice count disable register
When this register is set, it synchronously disables the POSi counter when the POSi
counter reaches a zero count. The CTRL_DISABLED register is not cleared at that time: it
remains set.
When starting COUNTi (by setting CTRL_ENi), this register should always be cleared. If
only on POSi countdown is needed (when only one slice should be processed), then this
register should be set after COUNTi is started with register CTRL_ENi.
20.6.18 Shift clock interrupt clear mask register
This register clears the shift clock interrupt mask of a slice.
Table 290. GPIO output enable register (GPIO_OENREG, address 0x4010 1218) bit
description
Bit
Symbol
Description
Reset
value
Access
15:0
GPIO_OE
Bit i selects the output enable state of SGPIO pin
i.
0 = GPIO output i is tri-stated.
1 = GPIO output i is active.
0
R/W
31:16
-
Reserved.
-
-
Table 291. Slice count enable register (CTRL_ENABLE, address 0x4010 121C) bit
description
Bit
Symbol
Description
Reset
value
Access
15:0
CTRL_EN
Slice count enable. Bit n controls slice n (0 = slice
A, ..., 15 = slice P).
0 = Disables slice shift clock.
1 = Starts COUNTn or external shift clock.
0
R/W
31:16 -
Reserved.
-
-
Table 292. Slice count disable register (CTRL_DISABLE, address 0x4010 1220) bit
description
Bit
Symbol
Description
Reset
value
Access
15:0
CTRL_DIS
Slice count disable. Bit n controls slice n, (0 =
slice A, ..., 15 = slice P).
0 = Enables COUNT and POS counters. The
counters start counting when the CTRL_EN bit
or bits are set in the CTRL_ENABLED register.
1 = Disables POS counter of slice n.
0
R/W
31:16 -
Reserved.
-
-