參數(shù)資料
型號: PIC17C766-16/L
廠商: Microchip Technology
文件頁數(shù): 142/159頁
文件大小: 0K
描述: IC MCU OTP 16KX16 A/D 84PLCC
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 16
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
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 66
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 16x10b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 84-LCC(J 形引線)
包裝: 管件
配用: AC164318-ND - MODULE SKT MPLAB PM3 84PLCC
DVA17XL841-ND - DEVICE ADAPTER FOR PIC17C762
DM173001-ND - KIT DEVELOPMENT PICDEM17
AC164027-ND - ADAPTER PICSTART PLUS 84PLCC
AC174012-ND - MODULE SKT PROMATEII 84PLCC
PIC17C7XX
DS30289B-page 82
2000 Microchip Technology Inc.
10.5
PORTE and DDRE Register
PORTE is a 4-bit bi-directional port. The corresponding
data direction register is DDRE. A ’1’ in DDRE config-
ures the corresponding port pin as an input. A ’0’ in the
DDRE register configures the corresponding port pin
as an output. Reading PORTE reads the status of the
pins, whereas writing to PORTE will write to the port
latch. PORTE is multiplexed with the system bus.
When operating as the system bus, PORTE contains
the
control
signals
for
the
address/data
bus
(AD15:AD0). These control signals are Address Latch
Enable (ALE), Output Enable (OE) and Write (WR).
The control signals OE and WR are active low signals.
The timing for the system bus is shown in the Electrical
Specifications section.
Example 10-5 shows an instruction sequence to initial-
ize PORTE. 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 10-5:
INITIALIZING PORTE
FIGURE 10-11:
BLOCK DIAGRAM OF RE2:RE0 (IN I/O PORT MODE)
Note:
Three pins of this port are configured as
the system bus when the device’s configu-
ration bits are selected to Microprocessor
or Extended Microcontroller modes. The
other pin is a general purpose I/O or
Capture4 pin. In the two other micro-
controller modes, RE2:RE0 are general
purpose I/O pins.
MOVLB
1
; Select Bank 1
CLRF
PORTE, F
; Initialize PORTE data
; latches before setting
; the data direction
; register
MOVLW
0x03
; Value used to initialize
; data direction
MOVWF
DDRE
; Set RE<1:0> as inputs
; RE<3:2> as outputs
; RE<7:4> are always
; read as ’0’
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
Data Bus
RD_PORTE
WR_PORTE
RD_DDRE
WR_DDRE
EX_EN
CNTL
DRV_SYS
System Bus
Control
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