lpc2917 NXP Semiconductors, lpc2917 Datasheet - Page 41

• Manufacturer Part Number: lpc2917
• Description: Arm9 Microcontroller With Can And Lin
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2917_19_1
Preliminary data sheet
Fig 11. PCRSS block diagram
8.8.4.1 Overview
8.8.3 PCR subsystem clock description
8.8.4 Clock Generation Unit (CGU)
The PCRSS is clocked by a number of different clocks. CLK_SYS_PCRSS clocks the
AHB side of the AHB to DTL bus bridge and CLK_PCR_SLOW clocks the CGU, RGU and
PMU internal logic, see
BASE_SYS_CLK, which can be switched off in low-power modes. CLK_PCR_SLOW is
derived from BASE_PCR_CLK and is always on in order to be able to wake up from
low-power modes.
The key features are:
AHB2DTL
Bridge
Rev. 1.01 — 15 November 2007
Section
CGU
registers
Ring Oscillator
Xtal Oscillator
Low Power
(Ringo)
7.2.2. CLK_SYS_PCRSS is derived from
RGU
registers
POR
FDIV[6:0]
PLL
Input Deglitch/
Reset Output
Delay Logic
Reset from Watchdog counter
RSTN (device pin)
Sync
Power, Clock & Reset
ARM9 microcontroller with CAN and LIN
out0
out1
out9
RGU
CGU
…
base
clocks
PMU
LPC2917/19
© NXP B.V. 2007. All rights reserved.
AHB_RST
...
...
SCU_RST
WARM_RST
COLD_RST
PCR_RST
RGU_RST
POR_RST
branch
clocks
AHB Master
Disable Grant
wakeup_a
AHB Master
Disable Req
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