DFPIC165X Datasheet, PDF (3/6 Pages) Digital Core Design – High Performance 8-bit RISC Microcontroller

PINS DESCRIPTION
PIN
clk
clkwdt
por
mclr
prgdata[11:0]
ramdati[7:0]
t0cki
portai[7:0]
portbi[7:0]
portci[7:0]
prgdata[11:0]
ramdati[7:0]
prgaddr[11:0]
ramdatao[7:0]
ramaddr[7:0]
ramwe
ramoe
sleep
portao[7:0]
portbo[7:0]
portco[7:0]
trisa[7:0]
trisb[7:0]
trisc[7:0]
TYPE
DESCRIPTION
input Global clock
input Watchdog clock
input Global reset Power On Reset
input User reset
input Data bus from program memory
input Data bus from int. data memory
input Timer 0 input
input Port A input
input Port B input
input Port C input
input Data bus from program memory
input Data bus from int. data memory
output Program memory address bus
output Data bus for internal data memory
output RAM address bus
output Data memory write
output Data memory output enable
output Sleep signal
output Port A output
output Port B output
output Port C output
output Data direction pins for Port A
output Data direction pins for Port B
output Data direction pins for Port C
SYMBOL
clk
clkwdt
por
mclr
prgdata(11:0)
ramdatai(7:0)
t0cki
portai(7:0)
portbi(7:0)
portci(7:0)
prgaddr(11:0)
ramdatao(7:0)
ramaddr(7:0)
ramwe
ramoe
sleep
portao(7:0)
portbo(7:0)
portco(7:0)
trisa(7:0)
trisb(7:0)
trisc(7:0)
BLOCK DIAGRAM
clk
por
Hardware
Stack
mclr
sleep
prgdata
prgaddr
Control
Unit
t0cki
Timer 0
clkwdt
Watchdog
Timer
ALU
RAM
Controller
I/O
Ports
ramdatai
ramdatao
ramaddr
ramwe
ramoe
portai
portbi
portci
portao
portbo
portco
trisa
trisb
trisc
ALU – Arithmetic Logic Unit performs arithme-
tic and logic operations during execution of an
instruction. This module contains work register
(W) and Status register.
Control Unit – It performs the core synchroni-
zation and data flow control. This module
manages execution of all instructions. Per-
forms decode and control functions for all
other blocks. It contains program counter (PC)
and hardware stack.
Hardware Stack – The DFPIC165X configur-
able hardware stack. The stack space is not a
part of either program or data space and the
stack pointer is not readable or writable. The
PC is pushed onto the stack when CALL in-
struction is executed or an interrupt causes a
branch. The stack is popped while RETLW
instruction execution. The stack operates as a
circular buffer. This means that after the stack
has been pushed two times, the third push
overwrites the value that was stored from the
first push.
RAM Controller – It performs interface func-
tions between Data Memory and DFPIC165X
internal logic. It assures correct Data memory
addressing and data transfers. The
DFPIC165X supports two addressing modes:
direct or indirect. In Direct Addressing the 8-bit
direct address is computed from FSR(7:5) bits
5 least significant bits of instruction word.
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