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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1366 of 1441
NXP Semiconductors
UM10503
Chapter 50: LPC43xx/LPC43Sxx EEPROM memory
50.5.1.5 EEPROM clock divider register
The EEPROM device requires a 1500 kHz clock. The nominal value of the frequency is
1500 kHz, the lower limit is 800 kHz, the maximum limit is 1600 kHz.
This clock is generated by dividing the system bus clock. The clock divider register
contains the division factor.
If the division factor is 0, the clock is be IDLE to save power.
50.5.1.6 EEPROM power down register
Use the EEPROM power down register to put the EEPROM device in power down mode.
Do not put the EEPROM in power-down mode during a pending EEPROM operation.
After clearing this bit any EEPROM operation has to be suspended for 100
s while the
EEPROM wakes up.
Table 1163.EEPROM clock divider register (CLKDIV, address 0x4000 E014) bit description
Bits
Symbol
Description
Reset value
15:0
CLKDIV
Division factor (minus 1 encoded).
-
31:16
-
Reserved. Read value is undefined, only zero should be
written.
NA
cclk
CLKDIV
1
+
--------------------------------
1500kHz
Table 1164.EEPROM power down/DCM register (PWRDWN, address 0x4000 E018) bit
description
Bits
Symbol
Description
Reset
value
0
PWRDWN
Power down mode bit.
0 = not in power down mode.
1 = power down mode.
0
31:1
-
Reserved. Read value is undefined, only zero should be written.
NA