AT90S4433_14 Datasheet, PDF (76/126 Pages) ATMEL Corporation – Data and Non-volatile Program Memory

Figure 53. Port B Schematic Diagram (Pin PB3)
MOS
PULL-
UP
PB3
RD
RESET
R
Q
D
DDB3
C
WD
RESET
QR D
PORTB3
C
RL
WP
RP
WP: WRITE PORTB
WD: WRITE DDRB
RL: READ PORTB LATCH
RP: READ PORTB PIN
RD: READ DDRB
SPE: SPI ENABLE
MSTR MASTER SELECT
Figure 54. Port B Schematic Diagram (Pin PB4)
MOS
PULL-
UP
PB4
MSTR
SPE
SPI MASTER
OUT
SPI SLAVE
IN
RD
RESET
R
Q
D
DDB4
C
WD
RESET
QR D
PORTB4
C
RL
WP
WP: WRITE PORTB
WD: WRITE DDRB
RL: READ PORTB LATCH
RP: READ PORTB PIN
RD: READ DDRB
SPE: SPI ENABLE
MSTR MASTER SELECT
RP
MSTR
SPE
SPI SLAVE
OUT
SPI MASTER
IN
76 AT90S/LS4433
1042H–AVR–04/03