PIC17C756-16/L Microchip Technology, PIC17C756-16/L Datasheet - Page 76

• Manufacturer Part Number: PIC17C756-16/L
• Description: MICRO CTRL 16K MEMORY OTP 68PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 17Cr

Specifications of PIC17C756-16/L

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: OTP
• Ram Size: 902 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• For Use With: AC164308 - MODULE SKT FOR PM3 68PLCCDVA17XL681 - DEVICE ADAPTER FOR PIC17C752DM173001 - KIT DEVELOPMENT PICDEM17AC174007 - MODULE SKT PROMATEII 68PLCCAC164024 - ADAPTER PICSTART PLUS 68PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Eeprom Size: -

10.5
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 it will write to the port latch.
PORTE is multiplexed with the system bus. When
operating as the system bus, PORTE contains the con-
trol signals for the address/data bus (AD15:AD0).
These control signals are Address Latch Enable (ALE),
Output Enable (OE), and Write (WR). The control sig-
nals OE and WR are active low signals. The timing for
the system bus is shown in the Electrical Characteris-
tics section.
FIGURE 10-11: BLOCK DIAGRAM OF RE2:RE0 (IN I/O PORT MODE)
DS30264A-page 76
Note: I/O pins have protection diodes to V
Note:
PORTE and DDRE Register
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 microcon-
troller modes, RE2:RE0 are general pur-
pose I/O pins.
TTL
Input
Buffer
0
1
Data
Port
DD
and Vss.
R
Q
Q
Preliminary
CK
CK
S
D
D
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
MOVLB
CLRF
MOVLW
MOVWF
1
PORTE
0x03
DDRE
;
; latches before setting
; the data direction
; register
; Value used to initialize
; data direction
; Set RE<1:0> as inputs
; RE<3:2> as outputs
; RE<7:4> are always
; read as '0'
; Initialize PORTE data
Select Bank 1
1997 Microchip Technology Inc.
WR_PORTE
RD_PORTE
WR_DDRE
RD_DDRE
DRV_SYS
Data Bus
EX_EN
CNTL
SYS BUS
Control