NEC mPD4992 Manuals

Manuals and User Guides for NEC mPD4992. We have 1 NEC mPD4992 manual available for free PDF download: User Manual

NEC mPD4992 User Manual

NEC mPD4992 User Manual (47 pages)

8-bit Parallel I/O Calendar Clock

Brand: NEC | Category: Clock | Size: 0.15 MB

Table of Contents

Table of Contents
5
CHAPTER 1 OUTLINE of Μ PD4992

7
- Features
  7
- Pin Connections
  8
- Pin Functions
  9
- Block Diagram
  10
- Oscillation Stage and 15-Stage Binary Divider
  11
- Register Configuration
  11
- Notes on Use
  12
Chapter 2 Operations

13
- Write Timing
  13
- Read Timing
  15
- Outline of Registers
  17
- RTC Counter (R/W)
  18
- 12/24H and AM/PM Flags (R/W)
  19
- Leap Year Control Register and Leap Year Counter (R/W)
  20
- Mode Register (R/W)
  21
- TP Output (1) (Continuous Pulse Output)
  21
- TP Output (2) (Interval Pulse Output)
  22
- TP Output (3) (BUSY Output)
  22
- Test Mode
  22
- Control Register
  23
- Write Control Register
  24
- Read Control Register
  27
Chapter 3 Access Procedure

29
- Time Setting
  29
- Reading the Time
  30
- Using BUSY Signal to Interrupt CPU (TP: BUSY Signal Output)
  30
- Polling BUSY Flag
  32
- Reading the Time Twice
  33
- Limitations on Reading Time
  34
- Setting TP Output
  35
- Setting When OSC Flag
  36
Chapter 4 Electrical Specifications and Interface

39
- Crystal Oscillation Circuit
  39
- Oscillation Characteristics and Accuracy
  40
- Dependency on Load Capacitance
  40
- Dependency on Temperature
  42
- Adjusting Oscillation Frequency
  42
- Backup Circuit
  43
- Power-Fail Circuit
  44

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