Filter
Top Products
TMP92CM22
2007-02-16
92CM22-89
(6) Connecting external memory
Figure 3.6.1 shows an example of how to connect external memory to the
TMP92CM22.
This example connects ROM and SRAM in 16-bit width.
Figure 3.6.1 Example of External Memory
By resetting, TMP92CM22 function as output port. Output latch of P82 (
CS2 )
is cleared to “0”, and output “L”. Output latch of P80 (
CS0 ), P81 (CS1 ) and P83
(
CS3
) are set to “1”, and output “H”.
When set port 8 from port function to CS function, set need bit of P8FC register
to “1”.
Note: When set P82 as
CS2 after release reset, set function register remain output
latch of P82 is “0” (P8<P82> = 0). (P8FC<P82F> = 1)
If set function register (P8FC<P82F> = 1) after set output latch of P82 to “1”
(P8<P82> = 1), maybe don’t read ROM data during changing from port
function to
CS2 .
TMP92CM22 16-bit SRAM
RD
WRLL
WRLU
R/ W
OE
LB
UB
R/W
CS0 CE
A
0
A
1
A
2
A1
A2
A3
A0
Not connetion
16-bit ROM
OE
CE
DQ [15:0]
A
0
A
1
A
2
CS2
D [15:0] I/O [16:1]