參數(shù)資料
型號(hào): PIC17C756A-33I/L
廠商: Microchip Technology
文件頁數(shù): 133/159頁
文件大?。?/td> 0K
描述: IC MCU OTP 16KX16 A/D PWM 68PLCC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 19
系列: PIC® 17C
核心處理器: PIC
芯體尺寸: 8-位
速度: 33MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 50
程序存儲(chǔ)器容量: 32KB(16K x 16)
程序存儲(chǔ)器類型: OTP
RAM 容量: 902 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 68-LCC(J 形引線)
包裝: 管件
配用: AC164308-ND - MODULE SKT FOR PM3 68PLCC
DVA17XL681-ND - DEVICE ADAPTER FOR PIC17C752
DM173001-ND - KIT DEVELOPMENT PICDEM17
AC174007-ND - MODULE SKT PROMATEII 68PLCC
AC164024-ND - ADAPTER PICSTART PLUS 68PLCC
PIC17C7XX
DS30289B-page 74
2000 Microchip Technology Inc.
10.2
PORTB and DDRB Registers
PORTB is an 8-bit wide, bi-directional port. The corre-
sponding data direction register is DDRB. A ’1’ in DDRB
configures the corresponding port pin as an input. A ’0’
in the DDRB register configures the corresponding port
pin as an output. Reading PORTB reads the status of
the pins, whereas writing to PORTB will write to the port
latch.
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is
done by clearing the RBPU (PORTA<7>) bit. The weak
pull-up is automatically turned off when the port pin is
configured as an output. The pull-ups are enabled on
any RESET.
PORTB also has an interrupt-on-change feature. Only
pins configured as inputs can cause this interrupt to
occur (i.e., any RB7:RB0 pin configured as an output is
excluded from the interrupt-on-change comparison).
The input pins (of RB7:RB0) are compared with the
value in the PORTB data latch. The “mismatch” outputs
of RB7:RB0 are OR’d together to set the PORTB Inter-
rupt Flag bit, RBIF (PIR1<7>).
This interrupt can wake the device from SLEEP. The
user, in the Interrupt Service Routine, can clear the
interrupt by:
a)
Read-Write PORTB (such as: MOVPF PORTB,
PORTB
). This will end the mismatch condition.
b)
Then, clear the RBIF bit.
A mismatch condition will continue to set the RBIF bit.
Reading, then writing PORTB, will end the mismatch
condition and allow the RBIF bit to be cleared.
This interrupt-on-mismatch feature, together with soft-
ware configurable pull-ups on this port, allows easy
interface to a keypad and makes it possible for wake-
up on key depression. For an example, refer to Appli-
cation Note AN552, “Implementing Wake-up on
Keystroke.”
The interrupt-on-change feature is recommended for
wake-up on operations, where PORTB is only used for
the interrupt-on-change feature and key depression
operations.
FIGURE 10-5:
BLOCK DIAGRAM OF RB5:RB4 AND RB1:RB0 PORT PINS
Note:
On a device RESET, the RBIF bit is inde-
terminate, since the value in the latch may
be different than the pin.
Note: I/O pins have protection diodes to VDD and VSS.
Data Bus
Q
D
CK
Q
D
CK
Weak
Pull-up
Port
Input Latch
Port
Data
OE
WR_PORTB (Q4)
WR_DDRB (Q4)
RD_PORTB (Q2)
RD_DDRB (Q2)
RBIF
RBPU
Match Signal
from other
port pins
(PORTA<7>)
Peripheral Data In
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PIC17C756AT-16E/PT 功能描述:8位微控制器 -MCU 32KB 902 RAM 50 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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