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參數(shù)資料
| 型號： | W78958BF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT EMULATION MICROCONTROLLER |
| 中文描述： | 8位單片機(jī)仿真 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 272K |
| 代理商： | W78958BF |
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W78958B
- 12 -
FUNCTIONAL DESCRIPTION
The W78958B is available in two types, an advanced type and a standard type, which are intended
for use with different end products. The default product type is the advanced type. Both the advanced
type and the standard type are also available with an emulation function. To configure the W78958B
to operate as the advanced type or standard type and to enter the emulation mode, adjust the input
pin settings as shown in the table below. (Note that a transition between the advanced type and
standard type is not permitted after power-on.)
Advanced
→
Emulation
High
Low
Low High
Low High
Standard
→
Emulation
Low
High/Low
Low High
Low High
Notes
ENSTD
EA
ICESET
EMU
I
I
I
O
1
2
Notes:
1. This pin is pulled high internally.
2. This pin is pulled low internally.
The type transition diagram for the advanced and standard types is shown below:
STANDARD
TYPE
EMULATION
ICESET = 1
ICESET = 0
ADVANCED
TYPE
EMULATION
ICESET = 1
ICESET = 0
ENSTD =1
EA = 0
POWER ON
ENSTD =1
Figure E. 1
Note that a transition between the advanced type and standard type is not permitted after power-on.
Advanced Type, Normal Mode
At power-on, if
ENSTD
is set to high or left floating and
EA
is set to low, then the W78958B will
operate as the advanced type. The advanced type provides four general-purpose I/O ports for
W78C32 applications; the address and data bus are separated from Port 0 and Port 2 so that these
ports can be used as general-purpose I/O ports. In this type, DP4 is the data bus for external program
and data memory, AP5<7:0> are the low byte address, AP6<7:0> are the high byte address,
PSEN
enables the external program memory to DP4, and P3.6 (
WR
) and P3.7(
RD
) are the write and read
control signals for the external data memory, respectively. The external latch for multiplexing the low
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