參數(shù)資料
型號(hào)： M44C892
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁(yè)數(shù)： 19/84頁(yè)
文件大?。?/td> 643K
代理商： M44C892
M44C892
M44C092
Rev. A5, 14-Dec-01
26 (84)
3.2.4
Bidirectional Port 4
The bidirectional Port 4 is both a bitwise configurable I/O
port and provides the external pins for the Timer 2, SSI
and the voltage monitor input (VMI). As a normal port,
it performs in exactly the same way as bidirectional Port 2
(see figure 26). Two additional multiplexes allow data
and port direction control to be passed over to other inter-
nal modules (Timer 2, VM or SSI). The I/O-pins for SC
and SD line have an additional mode to generate an SSI–
interrupt.
All four Port 4 pins can be individually switched by the
P4CR–register . Figure 26 shows the internal interfaces to
bidirectional Port 4.
Master reset
Q
V
DD
VDD
BPxy
Mask options
*
PxDATy
I/O Bus
D
I/O Bus
*
Switched
*
S
PxCRy
S
Q
D
PxMRy
POut
(Direction)
PDir
Intx
*
PIn
VDD
Static
Pull-up
Static
Pull-down
pull-up
pull-down
Figure 26. Bidirectional Port 4 and Port 6
Port 4 Data Register (P4DAT)
Primary register address: ’4’hex
Bit 3
Bit 2
Bit 1
Bit 0
P4DAT
P4DAT3
P4DAT2
P4DAT1
P4DAT0
Reset value: 1111b
Port 4 Control Register (P4CR) Byte Write
Auxiliary register address: ’4’hex
Bit 3
Bit 2
Bit 1
Bit 0
P4CR
First write cycle
P41M2
P41M1
P40M2
P40M1
Reset value: 1111b
Bit 7
Bit 6
Bit 5
Bit 4
Second write cycle
P43M2
P43M1
P42M2
P42M1
Reset value: 1111b
P4xM2, P4xM1 – Port 4x Interrupt mode/direction code
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