Rainbow Electronics ATmega103L - Manual (Page 82)

ATmega603/103
82
Figure 60. Port B Schematic Diagram (Pin PB7)
Port C
PORT C is an 8-bit Output port.
The Port C pins have alternate functions related to the optional external data SRAM. When using the device with external
SRAM, Port C outputs the high-order address byte during accesses to external data memory. When a reset condition
becomes active, the port pins are not tristated, but the pins will assume their initial value after two stable clock cycles.
The Port C Data Register - PORTC
Bit 7 6 5 4 3 2 1 0
$15 ($35) PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 PORTC
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
DA
T
A
B
U
S
D
D
Q
Q
RESET
RESET
C
C
WD
WP
RD
RP
RL
MOS
PULL-
UP
PB7
R
R
WP:
WD:
RL:
RP:
RD: WRITE PORTB
WRITE DDRB
READ PORTB LATCH
READ PORTB PIN
READ DDRB
DDB7
PORTB7
COMP. MATCH 2
COM20
COM21
OUTPUT
MODE SELECT