PIC18F24J10-I/SS Microchip Technology Inc., PIC18F24J10-I/SS Datasheet - Page 111
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PIC18F24J10-I/SS
Manufacturer Part Number
PIC18F24J10-I/SS
Description
Microcontroller; 16 KB Flash; 1024 RAM; 0 EEPROM; 21 I/O; 28-Pin-SSOP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F24J10-ISS.pdf
(359 pages)
Specifications of PIC18F24J10-I/SS
A/d Inputs
10-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
0 Bytes
Input Output
21
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SSOP
Programmable Memory
16K Bytes
Ram Size
1K Bytes
Speed
40 MHz
Timers
1-8-bit, 2-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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9.7
In addition to its function as a general I/O port, PORTD
can also operate as an 8-bit wide Parallel Slave Port
(PSP) or microprocessor port. PSP operation is
controlled by the 4 upper bits of the TRISE register
(Register 9-1).
(TRISE<4>), enables PSP operation as long as the
Enhanced CCP module is not operating in dual output
or quad output PWM mode. In Slave mode, the port is
asynchronously readable and writable by the external
world.
The PSP can directly interface to an 8-bit micro-
processor data bus. The external microprocessor can
read or write the PORTD latch as an 8-bit latch. Setting
the control bit, PSPMODE, enables the PORTE I/O
pins to become control inputs for the microprocessor
port. When set, port pin RE0 is the RD input, RE1 is the
WR input and RE2 is the CS (Chip Select) input. For
this functionality, the corresponding data direction bits
of the TRISE register (TRISE<2:0>) must be config-
ured as inputs (set). The A/D port configuration bits,
PFCG3:PFCG0 (ADCON1<3:0>), must also be set to a
value in the range of ‘1010’ through ‘1111’.
A write to the PSP occurs when both the CS and WR
lines are first detected low and ends when either are
detected high. The PSPIF and IBF flag bits are both set
when the write ends.
A read from the PSP occurs when both the CS and RD
lines are first detected low. The data in PORTD is read
out and the OBF bit is clear. If the user writes new data
to PORTD to set OBF, the data is immediately read out;
however, the OBF bit is not set.
When either the CS or RD lines are detected high, the
PORTD pins return to the input state and the PSPIF bit
is set. User applications should wait for PSPIF to be set
before servicing the PSP; when this happens, the IBF
and OBF bits can be polled and the appropriate action
taken.
© 2006 Microchip Technology Inc.
Note:
Parallel Slave Port
The Parallel Slave Port is only available in
40/44-pin devices.
Setting
control
bit,
PSPMODE
Preliminary
PIC18F45J10 FAMILY
The timing for the control signals in Write and Read
modes is shown in Figure 9-4 and Figure 9-5,
respectively.
FIGURE 9-3:
Note:
Data Bus
Set Interrupt Flag
PSPIF (PIR1<7>)
WR LATD
or
WR PORTD
RD PORTD
RD LATD
I/O pins have diode protection to V
Data Latch
Q
D
One bit of PORTD
CK
EN
PORTD AND PORTE
BLOCK DIAGRAM
(PARALLEL SLAVE PORT)
EN
Q
D
Chip Select
Read
Write
DS39682B-page 109
DD
TTL
and V
TTL
TTL
TTL
PORTE Pins
SS
.
RDx pin
CS
WR
RD
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