MC68HC908QC16_07 Datasheet, PDF (243/274 Pages) Freescale Semiconductor, Inc – Microcontrollers

19.10 3.3-V Control Timing
3.3-V Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Unit
Internal operating frequency
Internal clock period (1/f_OP)
f_OP (f_Bus)
—
t_CYC
250
4
MHz
—
ns
RST input pulse width low⁽²⁾
t_RL
200
—
ns
IRQ interrupt pulse width low (edge-triggered)⁽²⁾
IRQ interrupt pulse period⁽²⁾
t_ILIH
200
—
ns
t_ILIL
Note⁽³⁾
—
t_CYC
1. V_DD = 3.0 to 3.6 Vdc, V_SS = 0 Vdc, T_A = T_L to T_H; timing shown with respect to 20% V_DD and 70% V_DD, unless otherwise
noted.
2. Values are based on characterization results, not tested in production.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t_CYC.
t_RL
RST
t_ILIL
t_ILIH
IRQ
Figure 19-6. RST and IRQ Timing
19.11 Oscillator Characteristics
Characteristic
Internal oscillator frequency⁽¹⁾
ICFS1:ICFS0 = 00
ICFS1:ICFS0 = 01
ICFS1:ICFS0 = 10
ICFS1:ICFS0 = 11 (not allowed if V_DD < 4.5 V)
Trim accuracy⁽²⁾⁽³⁾
Deviation from trimmed Internal oscillator⁽³⁾⁽⁴⁾
4, 8, 12.8, 25.6MHz, V_DD ± 10%, 0 to 70°C
4, 8, 12.8, 25.6MHz, V_DD ± 10%, –40 to 125°C
External RC oscillator frequency, RCCLK^{(1) (3)}
V_DD ≥ 4.5 V
V_DD < 4.5 V
External clock reference frequency ^{(1) (5) (6)}
V_DD ≥ 4.5 V
V_DD ≥ 3.0 V
Symbol
Min
—
f_INTCLK
—
—
—
Δ_{TRIM_ACC}
—
Δ_{INT_TRIM}
—
—
f_RCCLK
2
2
f_OSCXCLK
dc
dc
Typ
4
8
12.8
25.6
± 0.4
±2
—
—
—
Max
Unit
—
—
MHz
—
—
—
%
—
%
±5
12
MHz
8.4
—
32
MHz
—
16
— Continued on next page
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 3
Freescale Semiconductor
243