Agent skill

clock-expert

Expert on Intel 8284A Clock Generator for ES-1841. Provides guidance on system timing, CPU clock generation, peripheral clock, reset circuit, and wait state synchronization.

View SKILL.md on GitHub Repository
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Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/clock-expert

SKILL.md

Clock Expert - Intel 8284A / KR1810GF84

Expert knowledge for the ES-1841's clock generator.

Key Specifications

Property Value
Soviet Clone KR1810GF84
Crystal 14.31818 MHz
CPU Clock 4.77 MHz (÷3)
PCLK 2.39 MHz (÷6)

Clock Outputs

Output Frequency Duty Use
CLK 4.77 MHz 33% CPU clock
PCLK 2.39 MHz 50% Peripheral clock
OSC 14.31818 MHz - Color burst

Clock Derivation

text
Crystal: 14.31818 MHz
   ÷3  → CLK:  4.77272 MHz (CPU)
   ÷6  → PCLK: 2.38636 MHz (peripherals)
   ÷12 → PIT:  1.19318 MHz (timer)

Reset Circuit

  • RES input: Schmitt trigger
  • RESET output: Synchronized to CLK, active HIGH
  • Hold ≥4 CLK cycles after RES inactive

Ready Synchronization

text
READY = (RDY1 OR AEN1) AND (RDY2 OR AEN2)

Used for wait state insertion with slow devices.

Wait States

text
Normal:     T1 → T2 → T3 → T4
With waits: T1 → T2 → T3 → Tw... → T4

Emulation Notes

For most emulation purposes:

  • Use fixed frequency values
  • Generate reset pulse on startup
  • Wait states often abstracted

References

See references/ for detailed documentation.

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