IA188EM-PQF100I-R datasheet(10/133 Pages) INNOVASIC

10 / 133 page

IA186EM/IA188EM

Data Sheet

8/16-BIT Microcontrollers

As of Production Version -03

PRL Value Processor Release Level

01h

02h

03h

04h

RES (bits 7-0) – Reserved.

PDCON (0f0h) - The Power-save CONtrol Register controls several miscellaneous system I/O and

timing functions.

The SYSCON contains 0000h at reset.

7 6 5 4 3

PSEN

RES

CBF CBD CAF CAD

RES

F2 F1 F0

PSEN (bit 15) – When set to 1, enables the power-save mode causing the internal operating clock to

be divided by the value in F2-F0. External interrupts or interrupts from internal interrupts

automatically clear PSEN. Software interrupts and exception do not clear PSEN. Note that the value of

PSEN is not restored upon execution of an IRET instruction.

RES (bit 14-12) – Reserved. These bits read back as zeros.

CBF (bit 11) – When set to 1, the clkoutb output follows the input crystal (PLL) frequency. When

this bit is 0, the clkoutb follows the internal clock frequency after the clock divider.

CBD (bit 10) – When set to 1, the clkoutb output is pulled low. When this bit is 0, the clkoutb is

driven as an output per the CBF bit.

CAF (bit 9) – When set to 1, the clkouta output follows the input crystal (PLL) frequency. When this

bit is 0, the clkouta follows the internal clock frequency after the clock divider.

CAD (bit 8) – When set to 1, the clkouta output is pulled low. When this bit is 0, the clkouta is driven

as an output per the CBF bit.

RES (bits 7-3) – Reserved. These bits read back as zeros.

F2-F0 (bits 2-0) – These bits control the clock divider as shown below. Note that PSEN must be 1 for

the clock divider to function.

3737 Princeton NE, Ste 130 • Albuquerque, NM 87107 • Tel 505.883.5263 • Fax 505.883.5477 • www.Innovasic.com

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