Chapter 22 External Bus Interface (S12XEBIV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
866 Freescale Semiconductor
Table 22-3. Input Threshold Levels on External Signals
ITHRS External Signal NS SS NX ES EX ST
0
DATA[15:8]
TAGHI, TAGLO
Standard Standard Standard Reduced Reduced Standard
DATA[7:0]
EWAIT Standard Standard
1
DATA[15:8]
TAGHI, TAGLO
Standard Standard
Reduced
if HDBE = 1 Reduced Reduced Reduced
DATA[7:0] Reduced
EWAIT Reduced
if EWAITE = 1 Standard Reduced
if EWAITE = 1 Standard
Table 22-4. External Address Bus Size
ASIZ[4:0] Available External Address Lines
00000 None
00001 UDS
00010 ADDR1, UDS
00011 ADDR[2:1], UDS
::
10110 ADDR[21:1], UDS
10111
:
11111
ADDR[22:1], UDS