参数资料
型号: PIC16C765-I/P
厂商: Microchip Technology
文件页数: 91/165页
文件大小: 0K
描述: IC MCU OTP 8KX14 USB 40DIP
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 10
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 24MHz
连通性: SCI,UART/USART,USB
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 33
程序存储器容量: 14KB(8K x 14)
程序存储器类型: OTP
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 4.35 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
产品目录页面: 636 (CN2011-ZH PDF)
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
其它名称: Q975613
2000 Microchip Technology Inc.
Preliminary
DS41124C-page 31
PIC16C745/765
5.0
I/O PORTS
Some pins for these I/O ports are multiplexed with an
alternate function for the peripheral features on the
device. In general, when a peripheral is enabled, that
pin may not be used as a general purpose I/O pin.
5.1
PORTA and TRISA Registers
PORTA is a 6-bit latch.
The RA4/T0CKI pin is a Schmitt Trigger input and an
open drain output. All other RA port pins have TTL
input levels and full CMOS output drivers. All pins have
data direction bits (TRIS registers), which can config-
ure these pins as output or input.
Setting a TRISA register bit puts the corresponding out-
put driver in a hi-impedance mode. Clearing a bit in the
TRISA register puts the contents of the output latch on
the selected pin(s).
Reading the PORTA register reads the status of the
pins, whereas writing to it will write to the port latch. All
write operations are read-modify-write operations.
Therefore, a write to a port implies that the port pins are
read, the value is modified, and then written to the port
data latch.
Pin RA4 is multiplexed with the Timer0 module clock
input to become the RA4/T0CKI pin.
On the PIC16C745/765, PORTA pins are multiplexed
with analog inputs and analog VREF input. The opera-
tion of each pin is selected by clearing/setting the con-
trol bits in the ADCON1 register (A/D Control
Register1).
The TRISA register controls the direction of the RA
pins, even when they are being used as analog inputs.
The user must ensure the bits in the TRISA register are
maintained set when using them as analog inputs.
EXAMPLE 5-1:
INITIALIZING PORTA
(PIC16C745/765)
BCF
STATUS, RP1
;
BCF
STATUS, RP0
;
CLRF
PORTA
; Initialize PORTA by
; clearing output
; data latches
BSF
STATUS, RP0
; Select Bank 1
MOVLW
0x06
; Configure all pins
MOVWF
ADCON1
; as digital inputs
MOVLW
0xCF
; Value used to
; initialize data
; direction
MOVWF
TRISA
; Set RA<3:0> as inputs
; RA<5:4> as outputs
; TRISA<7:6> are always
; read as ’0’.
FIGURE 5-1:
BLOCK DIAGRAM OF RA<3:0>
AND RA5 PINS
FIGURE 5-2:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
Note:
On all RESETS, pins with analog and digi-
tal functions are configured as analog
inputs.
Data
Bus
Q
D
Q
CK
Q
D
Q
CK
QD
EN
P
N
WR
Port
WR
TRIS
Data Latch
TRIS Latch
RD TRIS
RD Port
VSS
VDD
I/O Pin
Analog
Input
Mode
To A/D Converter
VDD
Schmitt Trigger
Input Buffer
Data
Bus
WR
Port
WR
TRIS
RD Port
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Input
Buffer
N
VSS
I/O pin
TMR0 Clock Input
Q
D
Q
CK
Q
D
Q
CK
EN
QD
EN
VDD
745cov.book Page 31 Wednesday, August 2, 2000 8:24 AM
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