Datasheet

PIC12C5XX
DS40139E-page 70  1999 Microchip Technology Inc.
11.4 Timing Diagrams and Specifications
FIGURE 11-2: EXTERNAL CLOCK TIMING - PIC12C508/C509
TABLE 11-2: EXTERNAL CLOCK TIMING REQUIREMENTS - PIC12C508/C509
AC Characteristics Standard Operating Conditions (unless otherwise specified)
Operating Temperature 0°C ≤ T
A ≤ +70°C (commercial),
–40°C ≤ T
A ≤ +85°C (industrial),
–40°C ≤ T
A ≤ +125°C (extended)
Operating Voltage V
DD range is described in Section 11.1
Parameter
No.
Sym Characteristic Min
Typ
(1)
Max Units Conditions
FOSC
External CLKIN Frequency
(2)
DC — 4 MHz XT osc mode
DC — 200 kHz LP osc mode
Oscillator Frequency
(2)
0.1 — 4 MHz XT osc mode
DC — 200 kHz LP osc mode
1T
OSC
External CLKIN Period
(2)
250 — — ns EXTRC osc mode
250 — — ns XT osc mode
5 — — ms LP osc mode
Oscillator Period
(2)
250 — — ns EXTRC osc mode
250 — 10,000 ns XT osc mode
5 — — ms LP osc mode
2Tcy
Instruction Cycle Time
(3)
—4/FOSC ——
3 TosL, TosH Clock in (OSC1) Low or High Time 50* — — ns XT oscillator
2* — — ms LP oscillator
4 TosR, TosF Clock in (OSC1) Rise or Fall Time — — 25* ns XT oscillator
— — 50* ns LP oscillator
* These parameters are characterized but not tested.
Note 1: Data in the Typical (“Typ”) column is at 5V, 25°C unless otherwise stated. These parameters are for design
guidance only and are not tested.
2: All specified values are based on characterization data for that particular oscillator type under standard oper-
ating conditions with the device executing code. Exceeding these specified limits may result in an unstable
oscillator operation and/or higher than expected current consumption.
When an external clock input is used, the “max” cycle time limit is “DC” (no clock) for all devices.
3: Instruction cycle period (T
CY) equals four times the input oscillator time base period.
OSC1
Q4
Q1 Q2
Q3 Q4 Q1
133
44
2