參數(shù)資料
型號(hào)： W78C438C40PL
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8-BIT, 40 MHz, MICROCONTROLLER, PQCC84
封裝： ROHS COMPLIANT, PLASTIC, LCC-84
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 266K
代理商： W78C438C40PL
W78C438C
Publication Release Date: December 4, 2006
- 11 -
Revision A6
5.4 Newly Added Special Function Registers
The W78C438C uses four newly defined special function registers, which are described in Table 4. To
read/write these registers, use the "MOV direct" or "read-modify-write" instructions.
REGISTER ADDR.
FUNCTION
LENGTH
R/W
TYPE
VALUE AFTER
RESET
1
HB
A1H
During the execution of "MOVX @Ri,"
the content of HB is output to AP6.
EPMA.7 determines functions of AP7.
EPMA.3
EPMA.0 determine values of
AP7<3:0> when EPMA.7 is "0."
A6H The content of P8 is output to port 8.
The bits of XICON determine/show the
functions/status of
INT2
INT3
.
Bit-
addressable.
8
R/W
00H
2
EPMA
A2H
8
R/W
70H
3
P8
8
R/W
0FFH
4
XICON
C0H
8
R/W
00H
Table 4. Newly Added Special Function Registers of the W78C438C
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 W78C438C, only XICON register is bit-addressable.
5.5 Power Reduction Function
The W78C438C 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
DP4
AP5, AP6
AP7
Idle
1 1
Port Data
Floating
Address
Note
Power Down
0 0
Port Data
Floating
Address
Note
Note:
AP7 is either 0 or a value decoded by AP6<7:6>, depending on the value of EPMA.7.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W78C438CF-24 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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W78C438CP-40 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W78C458 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT EMULATION MICROCONTROLLER
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