參數資料
型號: PIC16C745-I/SO
廠商: Microchip Technology
文件頁數: 93/165頁
文件大小: 0K
描述: IC MCU OTP 8KX14 USB A/D 28SOIC
產品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 27
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 24MHz
連通性: SCI,UART/USART,USB
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數: 22
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: OTP
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 4.35 V ~ 5.25 V
數據轉換器: A/D 5x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 管件
產品目錄頁面: 636 (CN2011-ZH PDF)
配用: XLT28SO-1-ND - SOCKET TRANSITION 28SOIC 300MIL
ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
2000 Microchip Technology Inc.
Preliminary
DS41124C-page 33
PIC16C745/765
5.2
PORTB and TRISB Registers
PORTB is an 8-bit wide bi-directional port. The corre-
sponding data direction register is TRISB. Setting a bit
in the TRISB register puts the corresponding output
driver in a hi-impedance input mode. Clearing a bit in
the TRISB register puts the contents of the output latch
on the selected pin(s).
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is per-
formed by clearing bit RBPU (OPTION_REG<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are dis-
abled on a Power-on Reset.
FIGURE 5-3:
BLOCK DIAGRAM OF RB<3:0>
PINS
Four of PORTB’s pins, RB<7:4>, have an interrupt-on-
change feature. Only pins configured as inputs can
cause this interrupt to occur (i.e., any RB<7:4> pin con-
figured as an output is excluded from the interrupt-on-
change comparison). The input pins (of RB<7:4>) are
compared with the value latched on the last read of
PORTB. The “mismatch” outputs of RB<7:4> are
OR’ed together to generate the RB Port Change Inter-
rupt with flag bit RBIF (INTCON<0>).
This interrupt can wake the device from SLEEP. The
user, in the interrupt service routine, can clear the inter-
rupt in the following manner:
a)
Any read or write of PORTB. This will end the
mismatch condition.
b)
Clear flag bit RBIF.
A mismatch condition will continue to set flag bit RBIF.
Reading PORTB will end the mismatch condition, and
allow flag bit RBIF to be cleared.
This interrupt-on-mismatch feature, together with soft-
ware configureable pull-ups on these four pins, allow
easy interface to a keypad and make it possible for
wake-up on key depression. Refer to the Embedded
Control Handbook, “Implementing Wake-Up on Key
Stroke” (AN552).
The interrupt-on-change feature is recommended for
wake-up on key depression operation and operations
where PORTB is only used for the interrupt-on-change
feature. Polling of PORTB is not recommended while
using the interrupt-on-change feature.
RB0/INT is an external interrupt input pin and is config-
ured using the INTEDG bit (OPTION_REG<6>).
RB0/INT is discussed in detail in Section 13.5.1.
FIGURE 5-4:
BLOCK DIAGRAM OF
RB<7:4> PINS
Data
WR
RB0/INT
Note 1: To enable weak pull-ups, set the appropriate TRIS bit(s)
Data Latch
P
VDD
Q
D
CK
Q
D
CK
QD
EN
RD TRIS
RD Port
weak
pull-up
RD Port
I/O
pin
TTL
Input
Buffer
Schmitt Trigger
Buffer
TRIS Latch
and clear the RBPU bit (OPTION_REG<7>).
VDD
Bus
Port
TRIS
RBPU(1)
Data Latch
From other
RBPU
(1)
P
VDD
I/O
Q
D
CK
Q
D
CK
QD
EN
QD
EN
Data Bus
WR Port
WR TRIS
Set RBIF
TRIS Latch
RD TRIS
RD Port
RB<7:4> pins
weak
pull-up
RD Port
Latch
TTL
Input
Buffer
pin
Note 1: To enable weak pull-ups, set the appropriate TRIS bit(s)
ST
Buffer
RB<7:6> in serial programming mode
Q3
Q1
and clear the RBPU bit (OPTION_REG<7>).
VDD
745cov.book Page 33 Wednesday, August 2, 2000 8:24 AM
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