LPC2917 datasheet(16/68 Pages) PHILIPS

16 / 68 page

LPC2917_19_1

Preliminary data sheet

Rev. 1.01 — 15 November 2007

16 of 68

NXP Semiconductors

LPC2917/19

ARM9 microcontroller with CAN and LIN

Both buffer lines are invalidated after:

• Initialization

• Configuration-register access

• Data-latch reading

• Index-sector reading

The modes of operation are listed in Table 8.

8.1.3 Flash memory controller pin description

The flash memory controller has no external pins. However, the flash can be programmed

via the JTAG pins, see Section 7.1.3.

8.1.4 Flash memory controller clock description

The flash memory controller is clocked by CLK_SYS_FMC, see Section 7.2.2.

8.1.5 Flash layout

The ARM processor can program the flash for ISP (In-System Programming) and IAP (In-

Application Programming). Note that the flash always has to be programmed by ‘flash

words’ of 128 bits (four 32-bit AHB bus words, hence 16 bytes).

The flash memory is organized into eight ‘small’ sectors of 8 kB each and up to 11 ‘large’

sectors of 64 kB each. The number of large sectors depends on the device type. A sector

must be erased before data can be written to it. The flash memory also has sector-wise

protection. Writing occurs per page which consists of 4096 bits (32 flash words). A small

sector contains 16 pages; a large sector contains 128 pages.

Table 9 gives an overview of the flash-sector base addresses.

Table 8.

Flash read modes

Synchronous timing

No buffer line

for single (non-linear) reads; one flash-word read per word read

Single buffer line

default mode of operation; most recently read flash word is kept until

another flash word is required

Asynchronous timing

No buffer line

one flash-word read per word read

Single buffer line

most recently read flash word is kept until another flash word is

required

Dual buffer line, single

speculative

on a buffer miss a flash read is done, followed by at most one

speculative read; optimized for execution of code with small loops

(less than eight words) from flash

Dual buffer line, always

speculative

most recently used flash word is copied into second buffer line; next

flash-word read is started; highest performance for linear reads

Table 9.

Flash sector overview

Sector number

Sector size (kB)

Sector base address

0000 0000h

0000 2000h

0000 4000h

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