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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 221K |
| 代理商： | W78C438B |
W78C438B
Publication Release Date: April 1997
- 9 -
Revision A4
BIT
7
ADDR.
0C7H
NAME
PX3
FUNCTION
High/low priority level for
INT3
is specified when this bit is set/cleared by software.
6
0C6H
EX3
Enable/disable interrupt from
INT3
when this bit is set/cleared by software.
If IT3 is "1," IE3 is set/cleared automatically by hardware when interrupt is
detected/serviced.
5
0C5H
IE3
4
0C4H
IT3
INT3
is falling-edge/low-level triggered when this bit is set/cleared by software.
3
0C3H
PX2
High/low priority level for
INT2
is specified when this bit is set/cleared by software.
2
0C2H
EX2
Enable/disable interrupt from
INT2
when this bit is set/cleared by software.
If IT2 is "1," IE2 is set/cleared automatically by hardware when interrupt is
detected/serviced.
1
0C1H
IE2
0
0C0H
IT2
INT2
is falling-edge/low-level triggered when this bit is set/cleared by software.
Table 2. Functions of XICON Register
INTERRUPT SOURCE
External Interrupt 0
Timer/Counter 0
External Interrupt 1
Timer/Counter 1
Serial Port
Timer/Counter 2
External Interrupt 2
External Interrupt 3
VECTOR ADDRESS
03H
0BH
13H
1BH
23H
2BH
33H
3BH
PRIORITY SEQUENCE
0 (Highest)
1
2
3
4
5
6
7 (Lowest)
Table 3. Priority of Interrupts
Newly Added Special Function Registers
The W78C438B 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
00H
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."
The content of P8 is output to port 8.
8
R/W
2
EPMA
A2H
8
R/W
70H
3
4
P8
A6H
C0H
8
8
R/W
R/W
0FFH
00H
XICON
The bits of XICON determine/show the functions/status of
INT2
INT3
.
Bit-addressable
.
Table 4. Newly Added Special Function Registers of the W78C438B
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