MC9S08GW64_11 Datasheet, PDF (29/42 Pages) Freescale Semiconductor, Inc – HC08 instruction set with added BGND instruction

3.10.1 Control Timing
Electrical Characteristics
Table 13. Control Timing
Num C
Rating
Symbol
Min
Typ¹
Max Unit
1
D Bus frequency (t_cyc = 1/f_Bus)
f_Bus
dc
—
20
MHz
2 D Internal low power oscillator period
t_LPO
700
—
1300 s
3 _{D External reset pulse width}²
t_extrst
100
—
—
ns
4 D Reset low drive
t_rstdrv
34 x t_cyc
—
—
ns
5
D
BKGD/MS setup time after issuing background debug
force reset to enter user or BDM modes
t_MSSU
500
—
—
ns
6
D
BKGD/MS hold time after issuing background debug
force reset to enter user or BDM modes ³
t_MSH
100
—
—
s
7
IRQ pulse width
D Asynchronous path²
Synchronous path⁴
8 D Keyboard interrupt pulse width
Asynchronous path²
Synchronous path⁴
9
Port rise and fall time — Non-LCD Pins
Low output drive (PTxDS = 0) (load = 50 pF)^{5, 6}
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
C
Port rise and fall time — Non-LCD Pins
High output drive (PTxDS = 1) (load = 50 pF)^{5, 6}
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
t_ILIH, t_IHIL
100
—
1.5 x t_cyc
—
t_ILIH, t_IHIL
100
—
1.5 x t_cyc
—
t_Rise, t_Fall
—
16
—
23
t_Rise, t_Fall
—
5
—
9
—
ns
—
—
ns
—
—
ns
—
—
ns
—
10 C Voltage Regulator Recovery time
t_VRR
—
6
10
us
1 _{Typical values are based on characterization data at VDD = 3.0 V, 25C unless otherwise stated.}
2 _{This is the shortest pulse that is guaranteed to be recognized as a reset pin request.}
3 _{To enter BDM mode following a POR, BKGD/MS should be held low during the power-up and for a hold time of tMSH after VDD}
rises above V_LVD.
4 _{This is the minimum pulse width that is guaranteed to pass through the pin synchronization circuitry. Shorter pulses may or}
may not be recognized. In stop mode, the synchronizer is bypassed so shorter pulses can be recognized.
5 _{Timing is shown with respect to 20% VDD and 80% VDD levels. Temperature range –40C to 85C.}
6 _{Except for LCD pins in Open Drain mode.}
RESET PIN
t_extrst
Figure 17. Reset Timing
MC9S08GW64 Series MCU Data Sheet, Rev. 3
Freescale Semiconductor
29