Programming Model
http://www.motorola.com/computer/literature 3-59
3
rom b we When rom b we is set, writes to Block B ROM/Flash are enabled. When rom b we is cleared, they are disabled. Refer back to Table 3-13 for more details.ROM Speed Attributes Registersrom_a_spd0,1 rom_a_spd0,1 determine the access timing used for ROM/Flash Block A. The encoding of these bits are shown in Table 3-15.The device access times shown in the table are conservative and allow time for buffers on address, control, and data signals. For more accura te information see the section entitled Timing Specifications for ROM/Flash Signals further on in this manual, along with the section titled ROM/Flash Read Timing Diagram.Address $FEF80060
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Name
0
0
rom a spd0
rom a spd1
0
0
rom b spd0
rom b spd1
Operation READ ZERO READ ZERO READ ZERO
R
R
R/W
R/W
R
R
R/W
R/W
Reset XXX
X
X
0 PL
0 PL
X
X
0 PL
0 PL