(1) Ports A0 to 3, B0 to 3
LC6512A, LC6513A
Ports A,B
DSB---Input inhibit at HOLD mode
Internal bus
Functions • 4-bit input (IP instruction)
• Single-bit test (BP, BNP instructions)
• Port A: Low-threshold input
• Port B: Normal-threshold input
(2) Ports C0 to 3, D0 to 3
Ports C,D
DSB---Input output inhibit at HOLD mode
Output: High impedance
Internal bus
Output
inhibit
DSB---Output control (Control register)
Functions 1. Input mode (Output inhibit)
• 4-bit input (IP instruction)
• Single-bit test (BP, BNP instructions)
2. Output mode
• 4-bit output (OP instruction)
• Single-bit set, reset (SPB, RPB instructions)
(3) Ports E0 to 3, F0 to 3, G0 to 3, H0 to 3, I0 to 1 (High-voltage ports)
DSB=Output inhibit at HOLD mode (Output transistor OFF)
Ports E to I
Internal bus
Functions • 4-bit (2-bit for port I) output (OP instruction)
• 4-bit (2-bit for port I) input of output latch contents (IP instruction)
• Single-bit set, reset (SPB, RPB instructions)
Set: The output represents a 1. ----- Output transistor ON
Reset: The output represents a 0. ----- Output transistor OFF
• Single-bit test of output latch contents (BP, BNP instructions)
• PortsE, F, I: FLT digits drive
• Ports G, H: FLT segments drive
No.2367–11/24