TDA8029 Datasheet, PDF (26/59 Pages) NXP Semiconductors – Low power single card reader

Philips Semiconductors
TDA8029
Low power single card reader
Table 33: AUXR - auxiliary register (address 8Eh) bit description
Bit
Symbol
Description
7 to 2 -
Not implemented. Reserved for future use ^[1]
1
EXTRAM
External RAM access. Internal or external RAM access using
MOVX @Ri/@DPTR. If EXTRAM = 0, internal expanded RAM (0000h
to 01FFh) access using MOVX @Ri/@DPTR; if EXTRAM = 1, external
data memory access.
0
AO
ALE enable or disable. If AO = 0, ALE is emitted at a constant rate of
1_{⁄6fXTAL; if AO = 1, ALE is active only during a MOVX or MOVC}
instruction.
[1] Do not write logic 1s to reserved bits. These bits may be used in future 80C51 family products to invoke
new features. In that case, the reset or inactive value of the new bit will be logic 0, and its active value will
be logic 1. The value read from a reserved bit is indeterminate.
8.7 Reduced EMI mode
When bit AO = 1 (bit 0 in the AUXR register), the ALE output is disabled.
8.8 Mask ROM devices
Security bits: With none of the security bits programmed the code in the program memory
can be verified. If the encryption table is programmed, the code will be encrypted when
verified. When only security bit 1 is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes from the internal
memory. When security bits 1 and 2 are programmed, in addition to the above, verify
mode is disabled.
Encryption array: 64 byte of encryption array are initially unprogrammed (all 1s).
Table 34: Program security bits for TDA8029
Program lock bits ^[1]
Protection description
SB1
SB2
no
no
no program security features enabled. If the encryption array is
programmed, code verify will still be encrypted.
yes
no
MOVC instructions executed from external program memory are
disabled from fetching code bytes from internal memory
yes
yes
same as above, also verify is disabled
[1] Any other combination of the security bits is not defined.
8.9 ROM code submission for 16 kB ROM device TDA8029HL/C1
When submitting ROM code for 16 kB ROM devices, the following must be specified:
• 16 kB user ROM data
• 64 byte ROM encryption key
• ROM security bits.
9397 750 14145
Product data sheet
Rev. 03 — 22 February 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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