S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 5 External Bus Interface (S12XEBIV4)
•
•
5.5.2.2
Example 2b: Emulation Expanded Mode
This mode is used for emulation systems in which the target application is operating in normal expanded
mode.
If the external bus is used with a PRU, the external device rebuilds the data select and data direction signals
UDS, LDS, RE, and WE from the ADDR0, LSTRB, and RW signals.
Figure 5-6
shows the PRU connection with the available external bus signals in an emulator application.
S12X_EBI
ADDR[22:0]/IVD[15:0]
DATA[15:0]
EMULMEM
Emulator
PRU
PRR
Ports
LSTRB
RW
UDS
LDS
RE
WE
ADDR[22:20]/ACC[2:0]
ADDR[19:16]/
IQSTAT[3:0]
CS[3:0]
EWAIT
ECLK
ECLKX2
Figure 5-6. Application in Emulation Expanded Mode
The timings of accesses with 1 stretch cycle are shown in
• Figure ‘Example 2b: Emulation Expanded Mode — Read with 1 Stretch Cycle’
• Figure ‘Example 2b: Emulation Expanded Mode — Write with 1 Stretch Cycle’
The associated timing numbers are given in
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
259
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
ECLKX2 rising edges have the same timing as ECLK edges.
The timing for accesses to PRU registers, which take 2 cycles to complete, is the same as the timing
for an external non-PRR access with 1 cycle of stretch as shown in example 2b.
