Rainbow Electronics AT90LS4433 - Manual (Page 75)

75
AT90S/LS4433
1042G–AVR–09/02
Figure 51. Port B Schematic Diagram (Pin PB1)
Figure 52. Port B Schematic Diagram (Pin PB2)
PB1
DDB1
PORTB1
WP:
WD:
RL:
RP:
RD: WRITE PORTB
WRITE DDRB
READ PORTB LATCH
READ PORTB PIN
READ DDRB
DA
T
A
BUS
D
D
Q
Q
RESET
RESET
C
C
WD
WP
RD
MOS
PULL-
UP
PB2
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
DDB2
PORTB2
RL
RP