参数资料
型号: AT90S8515-8PC
厂商: Atmel
文件页数: 84/112页
文件大小: 0K
描述: IC MCU 8K FLSH 8MHZ 40DIP
标准包装: 18
系列: AVR® 90S
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
73
AT90S8515
0841G–09/01
Port D Data Register – PORTD
Port D Data Direction Register
– DDRD
Port D Input Pins Address –
PIND
The Port D Input Pins address (PIND) is not a register; this address enables access to
the physical value on each Port D pin. When reading PORTD, the Port D Data Latch is
read and when reading PIND, the logical values present on the pins are read.
Port D as General Digital I/O
PDn, general I/O pin: The DDDn bit in the DDRD register selects the direction of this pin.
If DDDn is set (one), PDn is configured as an output pin. If DDDn is cleared (zero), PDn
is configured as an input pin. If PDn is set (one) when configured as an input pin, the
MOS pull-up resistor is activated. To switch the pull-up resistor off the PDn has to be
cleared (zero) or the pin has to be configured as an output pin. The Port D pins are tri-
stated when a reset condition becomes active, even if the clock is not active.
Note:
n: 7,6…0, pin number.
Alternate Functions of Port D
RD – Port D, Bit 7
RD is the external data memory read control strobe. See “Interface to External SRAM”
on page 60 for detailed information.
WR – Port D, Bit 6
WR is the external data memory write control strobe. See “Interface to External SRAM”
on page 60 for detailed information.
OC1A – Port D, Bit 5
OC1A: Output compare match output. The PD5 pin can serve as an external output
when the Timer/Counter1 compare matches. The PD5 pin has to be configured as an
output (DDD5 set [one]) to serve this function. See the Timer/Counter1 description for
further details and how to enable the output. The OC1A pin is also the output pin for the
PWM mode timer function.
Bit
7
65
43
21
0
$12 ($32)
PORTD7
PORTD6
PORTD5
PORTD4
PORTD3
PORTD2
PORTD1
PORTD0
PORTD
Read/Write
R/W
Initial Value
0
Bit
7
65
43
21
0
$11 ($31)
DDD7
DDD6
DDD5
DDD4
DDD3
DDD2
DDD1
DDD0
DDRD
Read/Write
R/W
Initial Value
0
Bit
7
65
43
21
0
$10 ($30)
PIND7
PIND6
PIND5
PIND4
PIND3
PIND2
PIND1
PIND0
PIND
Read/Write
RR
Initial Value
N/A
Table 24. DDDn Bits on Port D Pins
DDDn
PORTDn
I/O
Pull-up
Comment
0
Input
No
Tri-state (high-Z)
0
1
Input
Yes
PDn will source current if ext. pulled low.
1
0
Output
No
Push-pull Zero Output
1
Output
No
Push-pull One Output
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