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Peripheral Control Block
4-8
Bits 2–0: Clock Divisor Select (F2–F0)—Controls the division factor when Power-Save
mode is enabled. Allowable values are as follows:
4.2 INITIALIZATION AND PROCESSOR RESET
Processor initialization or startup is accomplished by driving the RES input pin Low. RES
must be Low during power-up to ensure proper device initialization. RES
forces the
Am186ER and Am188ER microcontrollers to terminate all execution and local bus activity.
No instruction or bus activity occurs as long as RES
is active.
After RES
is deasserted and an internal processing interval elapses, the microcontroller
begins execution with the instruction at physical location FFFF0h. RES
also sets some
registers to predefined values as shown in Table 4-2.
F2 F1 F0 Divider Factor
000
Divide by 1 (2
0
)
001
Divide by 2 (2
1
)
010
Divide by 4 (2
2
)
011
Divide by 8 (2
3
)
100
Divide by 16 (2
4
)
101
Divide by 32 (2
5
)
110
Divide by 64 (2
6
)
111
Divide by 128 (2
7
)