Philips LPC2101 - Echo <Setting; Read Memory <Address> <No. of Bytes; Write to RAM <Start Address> <Number of Bytes

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 01 — 12 January 2006 237
Philips Semiconductors
UM10161
Volume 1 Chapter 19: Flash memory
19.8.3 Echo <setting>
19.8.4 Write to RAM <start address> <number of bytes>
The host should send the data only after receiving the CMD_SUCCESS return code. The
host should send the check-sum after transmitting 20 UU-encoded lines. The checksum is
generated by adding raw data (before UU-encoding) bytes and is reset after transmitting
20 UU-encoded lines. The length of any UU-encoded line should not exceed 61
characters(bytes) i.e. it can hold 45 data bytes. When the data fits in less then 20
UU-encoded lines then the check-sum should be of the actual number of bytes sent. The
ISP command handler compares it with the check-sum of the received bytes. If the
check-sum matches, the ISP command handler responds with "OK<CR><LF>" to
continue further transmission. If the check-sum does not match, the ISP command
handler responds with "RESEND<CR><LF>". In response the host should retransmit the
bytes.
19.8.5 Read memory <address> <no. of bytes>
The data stream is followed by the command success return code. The check-sum is sent
after transmitting 20 UU-encoded lines. The checksum is generated by adding raw data
(before UU-encoding) bytes and is reset after transmitting 20 UU-encoded lines. The
length of any UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold 45
data bytes. When the data fits in less then 20 UU-encoded lines then the check-sum is of
actual number of bytes sent. The host should compare it with the checksum of the
received bytes. If the check-sum matches then the host should respond with
Table 213: ISP Echo command
Command A
Input Setting: ON = 1 | OFF = 0
Return Code CMD_SUCCESS |
PA RA M_ E RR OR
Description The default setting for echo command is ON. When ON the ISP command handler
sends the received serial data back to the host.
Example "A 0<CR><LF>" turns echo off.
Table 214: ISP Write to RAM command
Command W
Input Start Address: RAM address where data bytes are to be written. This address
should be a word boundary.
Number of Bytes: Number of bytes to be written. Count should be a multiple of 4
Return Code CMD_SUCCESS |
ADDR_ERROR (Address not on word boundary) |
ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not multiple of 4) |
PA R AM _ E R RO R |
CODE_READ_PROTECTION_ENABLED
Description This command is used to download data to RAM. Data should be in UU-encoded
format. This command is blocked when code read protection is enabled.
Example "W 1073742336 4<CR><LF>" writes 4 bytes of data to address 0x4000 0200.