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參數(shù)資料
| 型號(hào)： | W78C438B |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT Microcontroller(8位的微控制器) |
| 中文描述： | 8位微控制器（8位的微控制器） |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 221K |
| 代理商： | W78C438B |
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W78C438B
- 10 -
Notes:
1. The instructions used to access these nonstandard registers may cause assembling errors with respect to the 2500 A. D.
assembler, but these errors can be ignored by adding directive ".RAMCHK OFF" ahead these instructions.
2. In the newly added SFR of W78C438B, only XICON register is bit-addressable.
Power Reduction Function
The W78C438B supports power reduction just as the W78C32 does. The following table shows the
status of the external pins during the idle and power-down modes.
FUNCTION
ALE, PSEN
P0 P3, P8
Port Data
Port Data
DP4
AP5, AP6
AP7
Idle
Power Down
1 1
0 0
Floating
Floating
Address
Address
Note
Note
Note: AP7 is either 0 or a value decoded by AP6<7:6>, depending on the value of EPMA.7.
Programming Difference
The W78C438B is programmed in the same way as the W78C32, except that the external data RAM
is accessed by a "MOVX @Ri" instruction. To support address paging, there is an additional 8-bit SFR
"HB" (high byte), which is a nonstandard register, at address 0A1H. During execution of the "MOVX
@Ri" instruction, the contents of HB are output to AP6. The page address is modified by loading the
HB register with a new value before execution of the "MOVX @Ri" instruction. To read/write the HB
register, one can use the "MOV direct" instruction or "read-modify-write" instructions. The HB register
does not support bit-addressable instructions.
[Example].
MOV
MOV
MOVX
R1, #0H
0A1H, #0FFH
A, @R1
; R1 = 0.
; HB contents FFH.
; Read the contents of external RAM location FF00H into
; Accumulator.
; HB contents 12H.
; Copies the contents of Accumulator into external RAM
; location 1200H.
MOV
MOVX
0A1H, #12H
@R1, A
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
V
DD
V
SS
V
IN
T
OPR
T
STG
MIN.
-0.3
V
SS
-0.3
0
-55
MAX.
+7.0
V
DD
+0.3
70
+150
UNIT
V
V
°
C
°
C
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperature
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
the device.
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相關(guān)代理商/技術(shù)參數(shù) |
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| W78C438BF-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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| W78C438BF-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78C438BP-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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