45111 datasheet(174/184 Pages) ETC2

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15 Appendix E: SX Data Sheet

Page 174

• SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.

15.4.3 Option

The OPTION register is a run-time writable register used to configure the RTCC and the Watchdog

Timer. The size of this register is affected by the OPTIONX device setting.

When OPTION Extend = 0, bits 7 and 6 are implemented.

When OPTION Extend = 1, bits 7 and 6 read as ‘1’s.

RTW - If = 0, register $01 is W

If = 1, register $01 is RTCC

RTI

- If = 0, RTCC roll-over interrupt is enabled

If = 1, RTCC roll-over interrupt is disabled

RTS - If = 0, RTCC increments on internal instruction cycle

If = 1, RTCC increments on transition of RTCC pin

RTE - If = 0, RTCC increments on low-to-high transition

If = 1, RTCC increments on high-to-low transition

PSA - If = 0, prescaler is assigned to RTCC, divide rate determined by PS0-PS2 bits

If = 1, prescaler is assigned to WDT, and divide rate on RTCC is 1:1

Figure 36 - Prescaler Division Ratios

PS2, PS1, PS0

RTCC

Divide Rate

Watchdog Timer

Divide Rate

000

1:2

1:1

001

1:4

1:2

010

1:8

1:4

011

1:16

1:8

100

1:32

1:16

101

1:64

1:32

110

1:128

1:64

111

1:256

1:128

15.4.4 Fuse Registers

The Fuse registers are accessible only at program time. The SX-Key Development System Software

provides a convenient interface that is easy to use to customize the SX. You may use the predefined

RTW RTI

RTS RTE PSA PS2 PS1 PS0

OPTION

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