NXP Semiconductors
DRAFT | D | D |
| AFT |
RAFT | RAFT AFT | |||
|
|
| DR | DR |
DLPC2917/19
ARM9 microcontrollerRAFT withDRAFTCANDRAFTand LINDRAFT
T DRAFT | T | |
DRA | DRA | DR |
F | F |
|
•Generation of 10 and 2
•Crystal oscillator with
•Control PLL with
•Very
•Seven fractional clock dividers with L/D divisionDRA
•Individual source selector for each base clock, with
•Autonomous
•Protection against switching to invalid or inactive clock sources
•Embedded frequency counter
•Register
Remark: Any
8.8.4.2Description
The clock generation unit provides 10 internal clock sources as described in Table 23.
Table 23. CGU base clocks
Number | Name | Frequency | Description |
|
| (MHz) [1] |
|
0 | BASE_SAFE_CLK | 0.4 | Base safe clock (always on) |
|
|
|
|
1 | BASE_SYS_CLK | 80 | Base system clock |
|
|
|
|
2 | BASE_PCR_CLK | 0.4 [2] | Base PCR subsystem clock |
3 | BASE_IVNSS_CLK | 80 | Base IVNSS subsystem clock |
|
|
|
|
4 | BASE_MSCSS_CLK | 80 | Base MSCSS subsystem clock |
|
|
|
|
5 | BASE_UART_CLK | 80 | Base UART clock |
|
|
|
|
6 | BASE_SPI_CLK | 40 | Base SPI clock |
|
|
|
|
7 | BASE_TMR_CLK | 80 | Base timers clock |
|
|
|
|
8 | BASE_ADC_CLK | 4.5 | Base ADCs clock |
|
|
|
|
[1]Maximum frequency that guarantees stable operation of the LPC2917/19.
[2]Fixed to
For generation of these base clocks, the CGU consists of primary and secondary clock generators and one output generator for each base clock.
LPC2917_19_1 | © NXP B.V. 2007. All rights reserved. |
Preliminary data sheet | Rev. 1.01 — 15 November 2007 | 42 of 68 |