TDA8029 Datasheet, PDF (26/58 Pages) NXP Semiconductors – Low power single card reader

Philips Semiconductors
Low power single card reader
Product specification
TDA8029
handbook, full pagewidth
1FFh
512-BYTE
XRAM
BY
MOVX
00h
FFh
UPPER
128-BYTE
INTERNAL
RAM
80h
LOWER
128-BYTE
INTERNAL
RAM
00h
FFFFh
200h
EXTERNAL
DATA
MEMORY
FFh
SPECIAL
FUNCTION
REGISTERS
80h
00h
00h
MCE651
Fig.9 Internal and external data memory address space with EXTRAM = 0.
8.6.1 AUXILIARY REGISTER (AUXR)
Table 29 Auxiliary register bits
BIT
7
Symbol
−
6
5
4
3
2
1
0
−
−
−
−
−
EXTRAM
AO
Table 30 Description of register bits
BIT
7 to 2
1
0
SYMBOL
−
EXTRAM
AO
DESCRIPTION
Not implemented. Reserved for future use; note 1.
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.
ALE enable or disable. If AO = 0, ALE is emitted at a constant rate of ¹/₆f_XTAL; if AO = 1,
ALE is active only during a MOVX or MOVC instruction.
Note
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.
2003 Oct 30
26