AT90S8515-8PC Atmel, AT90S8515-8PC Datasheet - Page 70

• Manufacturer Part Number: AT90S8515-8PC
• Description: IC MCU 8K FLSH 8MHZ 40DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8515-8PC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Port C
Port C Data Register – PORTC
70
AT90S8515
Figure 51. Port B Schematic Diagram (Pin PB7)
Port C is an 8-bit bi-directional I/O port. Three I/O memory address locations are allo-
cated for the Port C, one each for the Data Register – PORTC, $15($35), Data Direction
Register – DDRC, $14($34) and the Port C Input Pins – PINC, $13($33). The Port C
Input Pins address is read-only, while the Data Register and the Data Direction Register
are read/write.
All port pins have individually selectable pull-up resistors. The Port C output buffers can
sink 20 mA and thus drive LED displays directly. When pins PC0 to PC7 are used as
inputs and are externally pulled low, they will source current if the internal pull-up resis-
tors are activated.
The Port C pins have alternate functions related to the optional external data SRAM.
Port C can be configured to be the high-order address byte during accesses to external
data memory. When Port C is set to the alternate function by the SRE (external SRAM
enable) bit in the MCUCR (MCU Control Register), the alternate settings override the
Data Direction Register.
Bit
$15 ($35)
Read/Write
Initial Value
PORTC7
R/W
PB7
7
0
WP:
WD:
RL:
RP:
RD:
SPE:
MSTR
MOS
PULL-
UP
WRITE PORTB
WRITE DDRB
READ PORTB LATCH
READ PORTB PIN
READ DDRB
SPI ENABLE
MASTER SELECT
PORTC6
R/W
6
0
PORTC5
R/W
5
0
PORTC4
R/W
4
0
PORTC3
R/W
3
0
PORTC2
R/W
RL
RP
2
0
Q
Q
PORTB7
RESET
RESET
DDB7
WD
WP
RD
R
C
R
C
PORTC1
R/W
D
D
1
0
MSTR
SPE
SPI CLOCK
OUT
SPI CLOCK
IN
PORTC0
R/W
0
0
0841G–09/01
PORTC