Datasheet

C161K
C161O
Data Sheet 8 V2.0, 2001-01
Note: The following behavioral differences must be observed when the bidirectional
reset is active:
• Bit BDRSTEN in register SYSCON cannot be changed after EINIT and is cleared
automatically after a reset.
• The reset indication flags always indicate a long hardware reset.
• The PORT0 configuration is treated like on a hardware reset. Especially the bootstrap
loader may be activated when P0L.4 is low.
• Pin RSTIN
may only be connected to external reset devices with an open drain output
driver.
• A short hardware reset is extended to the duration of the internal reset sequence.
P2
P2.9
P2.10
P2.11
P2.12
72
73
74
75
IO
I
I
I
I
Port 2 is a 7-bit bidirectional I/O port. It is bit-wise
programmable for input or output via direction bits. For a pin
configured as input, the output driver is put into high-
impedance state. Port 2 outputs can be configured as push/
pull or open drain drivers. The following Port 2 pins serve for
alternate functions:
EX1IN Fast External Interrupt 1 Input
EX2IN Fast External Interrupt 2 Input
EX3IN Fast External Interrupt 3 Input
EX4IN Fast External Interrupt 4 Input
76
77
78
I
I
I
EX5IN Fast External Interrupt 5 Input
EX6IN Fast External Interrupt 6 Input
EX7IN Fast External Interrupt 7 Input
These external interrupts are only available in the C161O.
P5
P5.14
P5.15
79
80
I
I
I
Port 5 is a 2-bit input-only port with Schmitt-Trigger char. The
pins of Port 5 also serve as timer inputs:
T4EUD GPT1 Timer T4 External Up/Down Control Input
T2EUD GPT1 Timer T2 External Up/Down Control Input
V
DD
4, 22,
37, 64
– Digital Supply Voltage:
+ 5 V or + 3 V during normal operation and idle mode.
≥ 2.5 V during power down mode.
V
SS
1, 21,
38, 63
– Digital Ground.
Table 2 Pin Definitions and Functions (cont’d)
Symbol Pin
Num
Input
Outp.
Function