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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