MFR4200MAE40 FREESCALE [Freescale Semiconductor, Inc], MFR4200MAE40 Datasheet - Page 236

• Manufacturer Part Number: MFR4200MAE40
• Description: FlexRay Communication Controllers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Electrical Characteristics
A.5
The HCS12 device external bus is synchronous with clock frequency up to 8 MHz. Signals are sampled on
the both ECLK# edges (see
The HCS12 host addresses the CC as a slow memory device. Due to that the HCS12 ECLK external clock
signal must be stretched. In the MFR4200 the output ECLK clock must be stretched by 3 periods of the
HCS12 internal bus-rate clock.
The CC HCS12 Interface read/write timing diagram is shown in
For more information regarding the HCS12 and HCS12 programming, refer to the HCS12 V1.5 core user
guide, available at
236
(x)Addr/Data
(x)Addr/Data
LSTRB
(write)
ECLK
(read)
ACS
R/W
HCS12 Interface Timing Diagram
data
data
http://www.freescale.com/files/microcontrollers/doc/ref_manual/S12CPU15UG.pdf.
10
Figure A-5. HCS12 Interface Read/write Timing Diagram
20
7
Figure
A-5).
1
MFR4200 Data Sheet, Rev. 0
8
11
3
(x)addr
(x)addr
12
4
ACS
Figure
13
5
2
A-5.
data
14
Freescale Semiconductor
data
15
22
6
9