参数资料
型号: AT90S2313-10PC
厂商: Atmel
文件页数: 54/92页
文件大小: 0K
描述: IC MCU 2K FLSH 10MHZ UART 20DIP
标准包装: 18
系列: AVR® 90S
核心处理器: AVR
芯体尺寸: 8-位
速度: 10MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 15
程序存储器容量: 2KB(1K x 16)
程序存储器类型: 闪存
EEPROM 大小: 128 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 20-DIP(0.300",7.62mm)
包装: 管件
PIC16C6X
DS30234D-page 58
1997 Microchip Technology Inc.
5.5
PORTE and TRISE Register
PORTE has three pins, RE2/CS, RE1/WR, and
RE0/RD which are individually congurable as inputs
or outputs. These pins have Schmitt Trigger input buff-
ers.
I/O PORTE becomes control inputs for the micropro-
cessor port when bit PSPMODE (TRISE<4>) is set. In
this mode, the user must make sure that the
TRISE<2:0> bits are set (pins are congured as digital
inputs). In this mode the input buffers are TTL.
Figure 5-9 shows the TRISE register, which controls
the parallel slave port operation and also controls the
direction of the PORTE pins.
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
FIGURE 5-8:
PORTE BLOCK DIAGRAM
(IN I/O PORT MODE)
Data
bus
WR
PORT
WR
TRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
input
buffer
Q
D
CK
Q
D
CK
EN
QD
EN
I/O pin(1)
Note 1: I/O pins have protection diodes to VDD and VSS.
FIGURE 5-9:
TRISE REGISTER (ADDRESS 89h)
R-0
R/W-0
U-0
R/W-1
IBF
OBF
IBOV
PSPMODE
bit2
bit1
bit0
R
= Readable bit
W = Writable bit
U
= Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7
bit0
bit 7 :
IBF: Input Buffer Full Status bit
1 = A word has been received and is waiting to be read by the CPU
0 = No word has been received
bit 6:
OBF: Output Buffer Full Status bit
1 = The output buffer still holds a previously written word
0 = The output buffer has been read
bit 5:
IBOV: Input Buffer Overow Detect bit (in microprocessor mode)
1 = A write occurred when a previously input word has not been read (must be cleared in software)
0 = No overow occurred
bit 4:
PSPMODE: Parallel Slave Port Mode Select bit
1 = Parallel slave port mode
0 = General purpose I/O mode
bit 3:
Unimplemented: Read as '0'
PORTE Data Direction Bits
bit 2:
Bit2: Direction Control bit for pin RE2/CS
1 = Input
0 = Output
bit 1:
Bit1: Direction Control bit for pin RE1/WR
1 = Input
0 = Output
bit 0:
Bit0: Direction Control bit for pin RE0/RD
1 = Input
0 = Output
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