PSD4235G2V-10U STMICROELECTRONICS [STMicroelectronics], PSD4235G2V-10U Datasheet - Page 50

• Manufacturer Part Number: PSD4235G2V-10U
• Description: Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

PSD4256G6V
Data Byte Enable Reference for a 16-bit Bus
MCUs have different data byte orientations. Table
35 to Table 38 show how the PSD4256G6V inter-
prets byte/word operations in different bus WRITE
configurations. Even-byte refers to locations with
address A0 equal to 0, and odd byte as locations
with A0 equal to 1.
Table 35. 16-Bit Data Bus with BHE
50/100
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
BHE
0
0
1
A0
0
1
0
Odd Byte
Odd Byte
—
D15-D8
Even Byte
—
Even Byte
D7-D0
16-bit MCU Bus Interface Examples
Figure 21, page 51 to Figure 26, page 57 show ex-
amples of the basic connections between the
PSD4256G6V and some popular MCUs. The
PSD4256G6V Control input pins are labeled as to
the MCU function for which they are configured.
The MCU bus interface is specified using PSDsoft.
The Voltage Standby (V
held at Ground if not in use.
Table 36. 16-Bit Data Bus with WRH and WRL
Table 37. 16-Bit Data Bus with SIZ0, A0
(Motorola MCU)
Table 38. 16-Bit Data Bus with LDS, UDS
(Motorola MCU)
WRH
WRH
SIZ0
0
0
1
0
1
1
0
1
0
WRL
WRL
A0
0
1
0
0
0
1
0
0
1
Odd Byte
Odd Byte
—
Even Byte
Even Byte
—
Even Byte
Even Byte
—
D15-D8
D15-D8
D15-D8
STBY
, PE6) line should be
Even Byte
—
Even Byte
Odd Byte
—
Odd Byte
Odd Byte
—
Odd Byte
D7-D0
D7-D0
D7-D0