Rainbow Electronics AT90LS8535 - Manual (Page 81)

81
AT90S/LS8535
1041H–11/01
Figure 53. Port B Schematic Diagram (Pins PB2 and PB3)
Figure 54. Port B Schematic Diagram (Pin PB4)
DA
TA
B
U
S
D
D
Q
Q
RESET
RESET
C
C
WD
WP
RD
MOS
PULL-
UP
PBn
AINm
TO COMPARATOR
WP:
WD:
RL:
RP:
RD:
n:
m: WRITE PORTB
WRITE DDRB
READ PORTB LATCH
READ PORTB PIN
READ DDRB
2, 3
0, 1
PWRDN
DDBn
PORTBn
RL
RP
DA
T
A
BUS
D
D
Q
Q
RESET
RESET
C
C
WD
WP
RD
MOS
PULL-
UP
PB4
SPI SS
MSTR
SPE
WP:
WD:
RL:
RP:
RD:
MSTR:
SPE: WRITE PORTB
WRITE DDRB
READ PORTB LATCH
READ PORTB PIN
READ DDRB
SPI MASTER ENABLE
SPI ENABLE
DDB4
PORTB4
RL
RP