2 internal pin structure – Atmel AT89C5132 User Manual
Page 10
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4173ES–USB–09/07
AT89C5132
4.2
Internal Pin Structure
Table 15. Detailed Internal Pin Structure
Notes:
1. For information on resistors value, input/output levels, and drive capability, refer to the
Section “DC Characteristics”, page 183.
2. When the Two Wire controller is enabled, P
1
, P
2
, and P
3
transistors are disabled allowing
pseudo open-drain structure.
3. In Port 2, P
1
transistor is continuously driven when outputting a high level bit address (A15:8).
Circuit
(1)
Type
Pins
Input
TST
Input/Output
RST
Input/Output
P1
(2)
P2
(3)
P3
P4
P53:0
Input/Output
P0
MCMD
MDAT
ISP
PSEN
Output
ALE
SCLK
DCLK
DOUT
DSEL
MCLK
Input/Output
D+
D-
R
TS
T
VDD
R
RS
T
VSS
P
VDD
Watchdog Output
P
3
VSS
N
P
1
VDD
VDD
2 osc
Latch Output
periods
P
2
VDD
VSS
N
P
VDD
VSS
N
P
VDD
D+
D-