參數(shù)資料
型號(hào): PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁(yè)數(shù): 47/100頁(yè)
文件大?。?/td> 933K
代理商: PSD4235G2-90UT
PSD4235G2
50/100
Data Byte Enable Reference
MCUs have different data byte orientations. Table
35 to Table 38 show how the PSD4235G2 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
MCU Bus Interface Examples
Figure 21 to Figure 26 show examples of the basic
connections between the PSD4235G2 and some
popular MCUs. The PSD4235G2 Control input
pins are labeled as to the MCU function for which
they are configured. The MCU bus interface is
specified using PSDsoft Express. The Voltage
Stand-by (VSTBY, PE6) line should be 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)
BHE
A0
D15-D8
D7-D0
0
Odd Byte
Even Byte
0
1
Odd Byte
1
0
Even Byte
WRH
WRL
D15-D8
D7-D0
0
Odd Byte
Even Byte
0
1
Odd Byte
1
0
Even Byte
SIZ0
A0
D15-D8
D7-D0
0
Even Byte
Odd Byte
1
0
Even Byte
1
Odd Byte
WRH
WRL
D15-D8
D7-D0
0
Even Byte
Odd Byte
1
0
Even Byte
0
1
Odd Byte
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