Chapter 22 External Bus Interface (S12XEBIV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 871
22.4.2.2.2 Write Access Timing

Table 22-12. Write Access (1 Cycle)

Access #0 Access #1 Access #2

Bus cycle -> ... 123
...
ECLK phase ... high low high low high low ...
ADDR[22:20] / ACC[2:0] ...
addr 0
acc 0
addr 1
acc 1
addr 2
acc 2 ...
ADDR[19:16] / IQSTAT[3:0] ... iqstat -1 iqstat 0 iqstat 1 ...
ADDR[15:0] / IVD[15:0] ... ?xx ...
DATA[15:0] (write) ... ?data 0 data 1 data 2 ...
R/W ...001111...

Table 22-13. Write Access (2 Cycles)

Access #0 Access #1
Bus cycle -> ... 123
...
ECLK phase ... high low high low high low ...
ADDR[22:20] / ACC[2:0] ...
addr 0
acc 0
addr 0
000
addr 1
acc 1 ...
ADDR[19:16] / IQSTAT[3:0] ... iqstat-1 iqstat 0 0000 ...
ADDR[15:0] / IVD[15:0] ... ?xx...
DATA[15:0] (write) ... ?data 0 x ...
R/W ...000011...

Table 22-14. Write Access (n–1 Cycles)

Access #0 Access #1
Bus cycle -> ... 123
... n...
ECLK phase ... high low high low high low ... high low ...
ADDR[22:20] / ACC[2:0] ...
addr 0
acc 0
addr 0
000
addr 0
000 ...
addr 1
acc 1 ...
ADDR[19:16] / IQSTAT[3:0] ... iqstat-1 iqstat 0 0000 ... 0000 ...
ADDR[15:0] / IVD[15:0] ... ?x x ... x ...
DATA[15:0] (write) ... ?data 0 x ...
R/W ...000000...11...