lpc2917 NXP Semiconductors, lpc2917 Datasheet - Page 16

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

NXP Semiconductors
LPC2917_19_1
Preliminary data sheet
8.1.3 Flash memory controller pin description
8.1.4 Flash memory controller clock description
8.1.5 Flash layout
Both buffer lines are invalidated after:
The modes of operation are listed in
Table 8.
The flash memory controller has no external pins. However, the flash can be programmed
via the JTAG pins, see
The flash memory controller is clocked by CLK_SYS_FMC, see
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
Table 9.
Synchronous timing
No buffer line
Single buffer line
Asynchronous timing
No buffer line
Single buffer line
Dual buffer line, single
speculative
Dual buffer line, always
speculative
Sector number
0
1
2
•
•
•
•
Initialization
Configuration-register access
Data-latch reading
Index-sector reading
gives an overview of the flash-sector base addresses.
Flash read modes
Flash sector overview
Rev. 1.01 — 15 November 2007
Sector size (kB)
8
8
8
Section
for single (non-linear) reads; one flash-word read per word read
default mode of operation; most recently read flash word is kept until
another flash word is required
one flash-word read per word read
most recently read flash word is kept until another flash word is
required
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
most recently used flash word is copied into second buffer line; next
flash-word read is started; highest performance for linear reads
7.1.3.
Table
8.
Sector base address
0000 0000h
0000 2000h
0000 4000h
ARM9 microcontroller with CAN and LIN
LPC2917/19
Section
© NXP B.V. 2007. All rights reserved.
7.2.2.
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