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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
429 of 1441
NXP Semiconductors
UM10503
Chapter 17: LPC43xx/LPC43Sxx System Control Unit (SCU)/ IO
17.4.10 SD/MMC delay register
This register provides a programmable delay for the SD/MMC sample and drive inputs
and outputs. See the
LPC43xx/LPC43Sxx data sheets
for recommended settings.
Typical setting for SD cards are SAMPLE_DELAY = 0x8 and DRV_DELAY = 0xF.
Remark:
The values DRV_DELAY = 0 and DRV_DELAY = 1 are not allowed.
17.4.11 Pin interrupt select register 0
This register selects one GPIO pin from all GPIO pins on all ports as the source for pin
interrupts 0 to 3.
Example: For pin interrupt 1, INTPIN1 = 0xA and PORTSEL1 = 1 select GPIO pin
GPIO1[10] located on pin P2_9 to generate an interrupt. Each pin interrupt must be
enabled in the NVIC.
To enable each pin interrupt and configure its edge or level sensitivity, use the GPIO pin
interrupt registers (see
Table 203. EMC clock delay register (EMCDELAYCLK, address 0x4008 6D00) bit description
Bit
Symbol
Description
Reset
value
Access
15:0
CLK_DELAY
EMC_CLKn SDRAM clock output delay.
0x0 = no delay
0x1111
0.5 ns delay
0x2222
1.0 ns delay
0x3333
1.5 ns delay
0x4444
2.0 ns delay
0x5555
2.5 ns delay
0x6666
3.0 ns delay
0x7777
3.5 ns delay
0
R/W
31:16
-
Reserved. Do not write ones to reserved register bits.
-
-
Table 204. SD/MMC delay register (SDDELAY, address 0x4008 6D80) bit description
Bit
Symbol
Description
Reset
value
Access
3:0
SAMPLE_DELAY
SD/MMC sample delay. The delay value is
SAMPLE_DELAY x 0.5 ns.
0
R/W
7:4
-
Reserved. Do not write ones to reserved register
bits.
-
-
11:8
DRV_DELAY
SD/MMC drive delay. The delay value is
DRV_DELAY x 0.5 ns. The values
DRV_DELAY = 0 and DRV_DELAY = 1 are not
allowed.
0
R/W
31: 12
-
Reserved. Do not write ones to reserved register
bits.
-
-