ATA6020N ATMEL Corporation, ATA6020N Datasheet - Page 26

• Manufacturer Part Number: ATA6020N
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

Figure 5-5.
5.2.3.1
5.2.3.2
Table 5-4.
26
P4DAT
P4CR
Auxiliary Address: ’4’hex
3 2 1 0
x x 1 1
x x 1 0
x x 0 1
x x 0 0
1 1 x x
1 0 x x
0 1 x x
0 0 x x
Code
ATA6020N
Function
BP40 in input mode
BP40 in output mode
BP40 enable alternate function (SC for SSI)
BP40 enable alternate function (falling edge interrupt
input for INT3)
BP41 in input mode
BP41 in output mode
BP41 enable alternate function (VMI for voltage
monitor input)
BP41 enable alternate function (T2I external clock
input for Timer 2)
Port 4 Data Register (P4DAT)
Port 4 Control Register (P4CR) Byte Write
Bi-directional Port 4
Port 4 Control Register
Master reset
First write cycle
Second write cycle
Bit 3
P4DAT3
PDir
I/O Bus
POut
I/O Bus
I/O Bus
Intx
PIn
PxDATy
PxCRy
D
D
P4xM2, P4xM1 – Port 4x Interrupt Mode/Direction Code
First Write Cycle
S
S
Q
Q
Bit 2
P4DAT2
(Direction)
PxMRy
Bit 3
P41M2
Bit 7
P43M2
Bit 1
P4DAT1
(1)
Bit 2
P41M1
Bit 6
P43M1
Mask options
Second Write Cycle
Bit 0
P4DAT0
3 2 1 0
x x 1 1
x x 1 0
x x 0 x
1 1 x x
1 0 x x
0 1 x x
0 0 x x
Code
V
Bit 1
P40M2
Bit 5
P42M2
DD
–
(1)
(1)
Pull-down
BP42 in input mode
BP42 enable alternate function (T2O for Timer 2)
BP43 in output mode
BP43 enable alternate function (falling edge interrupt
input for INT3)
–
Function
BP42 in output mode
BP43 in input mode
BP43 enable alternate function (SD for SSI)
Pull-up
Primary register address: ’4’hex
Reset value: 1111b
Bit 0
P40M1
Bit 4
P42M1
(1)
(1)
V
DD
V
DD
Auxiliary register address: ’4’hex
Reset value: 1111b
Reset value: 1111b
(1)
(1)
Static pull-up
Static pull-down
BPxy
4708D–4BMCU–09/05