AMD Am186TMER, Am188TMER user manual Initialization and Processor Reset, Divider Factor

Bits 2–0: Clock Divisor Select (F2–F0) —Controls the division factor when Power-Save mode is enabled. Allowable values are as follows:

F2	F1	F0	Divider Factor
0	0	0	Divide by 1 (20)
0	0	1	Divide by 2 (21)
0	1	0	Divide by 4 (22)
0	1	1	Divide by 8 (23)
1	0	0	Divide by 16 (24)
1	0	1	Divide by 32 (25)
1	1	0	Divide by 64 (26)
1	1	1	Divide by 128 (27)

4.2INITIALIZATION 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.

4-8 Peripheral Control Block