參數(shù)資料
型號: PIC17C756A-16I/L
廠商: Microchip Technology
文件頁數(shù): 137/159頁
文件大小: 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: 16MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 50
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 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 78
2000 Microchip Technology Inc.
10.3
PORTC and DDRC Registers
PORTC is an 8-bit bi-directional port. The correspond-
ing data direction register is DDRC. A ’1’ in DDRC con-
figures the corresponding port pin as an input. A ’0’ in
the DDRC register configures the corresponding port
pin as an output. Reading PORTC reads the status of
the pins, whereas writing to PORTC will write to the port
latch. PORTC is multiplexed with the system bus.
When operating as the system bus, PORTC is the low
order byte of the address/data bus (AD7:AD0). The tim-
ing for the system bus is shown in the Electrical Speci-
fications section.
Example 10-3 shows an instruction sequence to initial-
ize PORTC. The Bank Select Register (BSR) must be
selected to Bank 1 for the port to be initialized. The fol-
lowing example uses the MOVLB instruction to load the
BSR register for bank selection.
EXAMPLE 10-3:
INITIALIZING PORTC
FIGURE 10-9:
BLOCK DIAGRAM OF RC7:RC0 PORT PINS
Note:
This port is configured as the system bus
when the device’s configuration bits are
selected to Microprocessor or Extended
Microcontroller modes. In the two other
microcontroller modes, this port is a
general purpose I/O.
MOVLB
1
; Select Bank 1
CLRF
PORTC, F
; Initialize PORTC data
; latches before setting
; the data direction reg
MOVLW
0xCF
; Value used to initialize
; data direction
MOVWF
DDRC
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> as inputs
Note: I/O pins have protection diodes to VDD and VSS.
Q
D
CK
TTL
0
1
Q
D
CK
R
S
Input
Buffer
Port
Data
To D_Bus
→ IR
INSTRUCTION READ
Data Bus
RD_PORTC
WR_PORTC
RD_DDRC
WR_DDRC
EX_EN
DATA/ADDR_OUT
DRV_SYS
System Bus
Control
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