PIC12C671-04I/P Microchip Technology Inc., PIC12C671-04I/P Datasheet - Page 10
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PIC12C671-04I/P
Manufacturer Part Number
PIC12C671-04I/P
Description
8 PIN, 1.75 KB OTP, 128 RAM, 6 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC12C671-04IP.pdf
(129 pages)
Specifications of PIC12C671-04I/P
A/d Inputs
4-Channel, 8-Bit
Cpu Speed
2.5 MIPS
Eeprom Memory
0 Bytes
Input Output
5
Memory Type
OTP
Number Of Bits
8
Package Type
8-pin PDIP
Programmable Memory
1.75K Bytes
Ram Size
128 Bytes
Speed
4 MHz
Timers
1-8-bit
Voltage, Range
2.5-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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FIGURE 3-2:
EXAMPLE 3-1:
PIC12C67X
3.1
The clock input (from OSC1) is internally divided by
four to generate four non-overlapping quadrature
clocks, namely Q1, Q2, Q3 and Q4. Internally, the pro-
gram counter (PC) is incremented every Q1, and the
instruction is fetched from the program memory and
latched into the instruction register in Q4. The instruc-
tion is decoded and executed during the following Q1
through Q4. The clocks and instruction execution flow
is shown in Figure 3-2.
DS30561B-page 10
1. MOVLW 55h
2. MOVWF GPIO
3. CALL
4. BSF
5. Instruction @ address SUB_1
All instructions are single cycle, except for any program branches. These take two cycles since the fetched
instruction is “flushed” from the pipeline while the new instruction is being fetched and then executed.
Clocking Scheme/Instruction Cycle
OSC2/CLKOUT
INTRC modes)
(EXTRC and
SUB_1
GPIO, BIT3 (Forced NOP)
OSC1
CLOCK/INSTRUCTION CYCLE
PC
Q1
Q2
Q3
Q4
INSTRUCTION PIPELINE FLOW
Q1
Execute INST (PC-1)
Fetch 1
Fetch INST (PC)
T
Q2
CY
0
PC
Q3
Execute 1
Fetch 2
T
CY
Q4
1
Q1
Execute 2
Fetch 3
T
Execute INST (PC)
CY
Fetch INST (PC+1)
Q2
2
PC+1
3.2
An “Instruction Cycle” consists of four Q cycles (Q1,
Q2, Q3 and Q4). The instruction fetch and execute
are pipelined such that fetch takes one instruction
cycle, while decode and execute takes another
instruction cycle. However, due to the pipelining, each
instruction effectively executes in one cycle. If an
instruction causes the program counter to change
(i.e., GOTO), then two cycles are required to complete
the instruction (Example 3-1).
A fetch cycle begins with the program counter (PC)
incrementing in Q1.
In the execution cycle, the fetched instruction is
latched into the “Instruction Register" (IR) in cycle
Q1. This instruction is then decoded and executed
during the Q2, Q3, and Q4 cycles. Data memory is
read during Q2 (operand read) and written during Q4
(destination write).
Q3
Execute 3
Fetch 4
T
CY
Instruction Flow/Pipelining
Q4
3
Q1
Fetch SUB_1
Execute INST (PC+1)
Flush
T
Fetch INST (PC+2)
CY
Q2
1999 Microchip Technology Inc.
4
PC+2
Q3
Execute SUB_1
Q4
T
CY
5
Internal
phase
clock
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