NXP Semiconductors LPC24XX UM10237 - Manual (Page 62)

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User manual Rev. 04 — 26 August 2009 62 of 792
NXP Semiconductors
UM10237
Chapter 4: LPC24XX Clocking and power control
3.4.5 Peripheral power control
A Power Control for Peripherals feature allows individual peripherals to be turned off if
they are not needed in the application, resulting in additional power savings. This is
detailed in the description of the PCONP register.
3.4.6 Power control register description
The Power Control function uses registers shown in Table 4–59 . More detailed
descriptions follow.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.4.7 Power Mode Control register (PCON - 0xE01F C0C0)
Reduced power modes are controlled via the PCON register, as described in Table 4–60 .
Table 59. Power Control registers
Name Description Access Reset
value [1]
Address
PCON Power Control Register. This register
contains control bits that enable the two
reduced power operating modes of the
LPC2400. See
Table 4–60 .
R/W 0x00 0xE01F C0C0
INTWAKE Interrupt Wakeup Register. Controls which
interrupts will wake the LPC2400 from
power-down mode. See
Table 4–62
R/W 0x00 0xE01F C144
PCONP Power Control for Peripherals Register. This
register contains control bits that enable and
disable individual peripheral functions,
allowing elimination of power consumption by
peripherals that are not needed. R/W 0xE01F C0C4
Table 60. Power Mode Control register (PCON - address 0xE01F C0C0) bit description
Bit Symbol Description Reset
value
0 PM0 (IDL) Power mode control bit 0. See Table 4–61 for details. 0
1 PM1 (PD) Power mode control bit 1. See Table 4–61 for details. 0
2 BODPDM Brown-Out Power-down Mode. When BODPDM is 1, the Brown-Out
Detect circuitry will turn off when chip Power-down mode is entered,
resulting in a further reduction in power usage. However, the possibility
of using Brown-Out Detect as a wakeup source from Power-down mode
will be lost.
When 0, the Brown-Out Detect function remains active during
Power-down mode.
See Section 3–4 for details of Brown-Out detection.
0
3 BOGD Brown-Out Global Disable. When BOGD is 1, the Brown-Out Detect
circuitry is fully disabled at all times, and does not consume power.
When 0, the Brown-Out Detect circuitry is enabled.
See Section 3–4 for details of Brown-Out detection.
0