MC68HC912BD32 Datasheet, PDF (103/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Clocks
Clock Selection and Generation
There are two types of P clocks and E clocks while in wait mode that are
of interest to users:
• Global type (G) which is driven by the slow clock divider in wait
mode and drives all on-chip peripherals except the timer
• Global type (GBT) which remains at the oscillator divide-by-2 rate
in wait mode and drives and the timer.
Figure 12 shows clock timing relationships while in wait mode.
OSCILLATOR
T1 CLOCK
T2 CLOCK
T3 CLOCK
T4 CLOCK
E CLOCK
(G)¹
P CLOCK
(G)¹
E CLOCK
(GBT)²
P CLOCK
(GBT)²
Notes:
1. Driven by slow clock divider in wait mode. Drives on-chip peripherals except timer.
2. Remains at oscillator divided by 2 rate in wait mode. Drives timer.
Figure 11 Internal Clock Relationships in Wait Mode
3-clock
Clocks
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MC68HC912BD32 Rev 1.0