Panasonic MN101C00 4-6 Watchdog Timer Operation

Chapter 4 Timer Functions

78

4-6 Watchdog Timer Operation

4-6-1 Overview

The watchdog timer is controlled by the watchdog control register (WDCTR) and can

be used for runaway program detection.

4-6-2 Setup and Operation

(1) Set the WDEN flag of the watchdog timer control register (WDCTR) to "1" to start

the watchdog timer.

(2) Operate the watchdog timer by clearing the WDEN flag to "0" within the fixed

amount of time (TWD), and then resetting the WDEN flag to "1."

If the WDEN flag is not cleared, a WDT interrupt will be generated after the fixed

amount of time passes.

(3) When an illegal operation is detected, the program encoded at the location of the

WDT interrupt routine is executed.

TWDis set by the ROM option as fs/2 16, fs/218, or fs/220.

Illegal operation detection period vs. WDEN clear period is shown by the following formula:

Illegal operation detection period > [WDEN clear period] x 4

The upper 2 bits of the watchdog

timer are cleared when the WDEN

flag is set to "0." Therefore, if

WDEN flag is set to 0 when an

uppermost bit of a watchdog timer

is 1, WDT interrupt occurs

depending on the timing of this

clear the watchdog timer may be

reset at 1/4TWD. If the WDEN bit is

to be repeatedly cleared and set at

regular intervals, those operations

should be performed within 1/4 of

the TWDperiod.

When software resetting is not triggered by WDT interrupt,

hardware resetting (low level output at the reset terminal) takes

place at the next WDT interrupt.

Watchdog Timer Operation

Contents

Main Page Page How to Read This Manual Manual Configuration Main text Summary Key information Supplementary information Finding Desired Information Related Manuals Where to Send Inquires Page Page Page Contents Chapter 1 Overview Chapter 2 Basic CPU Functions Chapter 3 Port Functions Chapter 4 Timer Functions Chapter 5 Serial Functions Chapter 6 A/D Conversion Functions Chapter 7 AC Zero-Cross Circuit/Noise Filter Appendices Page Page 1-1 Product Overview 1-1-1 Overview 1-1-2 Product Summary 1-2 Hardware Functions Page Page Page Page 1-3-2 Pin Function Summary Table 1-3-1 Pin Function Summary (2/4) Table 1-3-1 Pin Function Summary (3/4) 10 Table 1-3-1 Pin Function Summary (4/4) 12 1-4 Overview of Functions 1-4-1 Block Diagram Figure 1-4-1 Block Diagram of Functions) CPU MN101C00 1-5 Electrical Characteristics 1-5-1 Absolute Maximum Ratings Note: 1Applicable even for an interval of 100ms. F or more between a power source pin and GND to prevent from latchup. does not damage a chip, not guarantee the operation. 1-5-2 Operating Conditions to t c4: XI is the CPU clock Ta=40to +85C VDD=2.0 to 5.5V VSS=0V Note: *1. Only for 48-QFH package *2 Applicable only for 48-pin QFH package External clock input 1 OSC1 (OSC2 is unconnected) External clock input 2 XI (XO is unconnected)*2 Page 1-5-3 DC Characteristics 18 Input pin 1 MMOD to Input pin 2 P20, P22~P23 (Schmitt trigger input) Input pin 31 P21 (Schmitt trigger input) Figure 1-5-5 Operation of AC Zero-Cross Detection Circuit to tfs V (Output) 20 I/O pin 5 P27 (RST) to I/O pin 6 P00 toP06, P10 to P14 (Schmitt trigger input) I/O pin 7 , P60 to P67 1-5-4 A/D Converter Characteristics to Ta=40 to+85C VDD=2.0 to 5.5V VSS=0V I/O pin 9 P80~P87 to 1-6 Option 1-6-1 ROM Option 22 Figure 1-6 ROM Option ( Address:X'7FFF' ) 1-6-2 Option Form 24 1-7 Outline Drawings Page 26 Page 28 2-1 Overview 2-2 Address Space 2-2-1 Memory Configuration 2-2-2 Special Function Registers Memory control register(MEMCTR) is a 4-bit register which set up the base Table 2-2-1 Register Map 2-3 Bus Interface 2-3-1 Overview 30 Figure 2-3-1 Memory Control Register MEMCTR:X'03F01'R/W 2-3-2 Control Registers 2-4 Interrupts 2-4-1 Accepting and Returning from Interrupts 32 2-4-2 Interrupt Sources and Vector Addresses * to X'04053'. Table 2-4-1 Interrupt Control Registers IRQ31CR cannot be used except for 48-pin QFH package. 2-4-3 Interrupt Control Registers n=0,1,2,3,4 34 Chapter 2 Basic CPU Functions Be sure to use the MIE flag of the PSW register to write to all interrupt control registers. Page 36 2-5 Reset Page 38 3-1 Overview Page 40 3-2 Port Control Registers 3-2-1 Overview 28 registers control the I/O ports. See table 3-2-1. Table 3-2-1 I/O Port Control Registers (1/2) Name Address R/W Function Table 3-2-1 I/O Port Control Registers (2/2) 42 Name Address R/W Function Figure 3-2-1 Port Control Registers (1/2) 01245673 Figure 3-2-1 Port Control Registers (2/2) 44 01245673 3-2-2 I/O Port Control Registers 46 3-3 I/O Port Configuration and Functions P00,P02,P10 to P14 48 PA0 to PA7 Figure 3-3-3 Configuration and Functions of PA0 to PA7 50 P23 is only for 48-pin package. P21 Figure 3-3-5 Configuration and Functions of P21 52 P27 Figure 3-3-6 Configuration and Functions of P27 P7PLUD0 P7DIR0 P7OUT0 P7IN0 P7PLUD1 P7DIR1 P7IN1 P7OUT1 54 P60 to P67,P80 to P87 Figure 3-3-9 Configuration and Functions of P80 to P87 Figure 3-3-8 Configuration and Functions of P60 to P67 Page 56 4-1 Overview Figure 4-1-1 Timers 2, 3 Block Diagram 58 Figure 4-1-2 Timer 4 Block Diagram Figure 4-1-3 Timer 5/Time Base Block Diagram 60 Figure 4-1-4 Watchdog Timer, Buzzer Block Diagram Figure 4-1-5 Remote Control Transmission Block Diagram 4-2 8-bit Timer Operation (timers 2, 3) 4-2-1 Overview Functions for timers 2 and 3 are listed below. Table 4-2-1 Summary of 8-bit Timer Functions 4-2-2 Operation 64 Page Page Page Page 4-3 16-bit Timer Operation (timer 4) 4-3-1 Overview 4-3-2 Operation Page Page Page Page 74 Page 76 4-4 8-bit Timer Operation (timer 5) 4-4-1 Overview 4-4-2 Operation 4-5 Time Base Operation 4-5-1 Overview 4-5-2 Operation 4-6 Watchdog Timer Operation 4-6-1 Overview 4-6-2 Setup and Operation 4-7 Remote Control Output Operation 4-7-1 Overview 4-7-2 Setup and Operation 80 4-8 Buzzer Output 4-8-1 Buzzer Output Setup and Operation 4-9 Timer Function Control Registers 4-9-1 Overview Function 19 registers control the timers. See table 4-9-1. Table 4-9-1 Timer Control Registers R/W: Readable and writable R: Read only 4-9-2 Programmable Timer/Counters Page 84 4-9-3 Timer Mode Registers Figure 4-9-13 Timer 2 Mode Register (TM2MD: X'03F82', R/W) (2) Timer 3 mode register (TM3MD) Figure 4-9-14 Timer 3 Mode Register (TM3MD: X'03F83', R/W) 86 (3) Timer 4 mode register (TM4MD) Figure 4-9-15 Timer 4 Mode Register (TM4MD: X'03F84', R/W) (4) Timer 5 mode register (TM5MD) * 48QFH package only Figure 4-9-16 Timer 5 Mode Register (TM5MD: X'03F88', R/W) 88 4-9-4 Timer Control Registers (1) Watchdog timer control register (WDCTR) (at reset: -------0) WDEN Timer Function Control Registers 90 Figure 4-9-19 Remote Control Carrier Control Register (RMCTR: X'03F89', R/W) Page 92 5-1 Overview Figure 5-1-1 Serial 0 Block Diagram 5-2 Synchronous Serial Interface 5-2-1 Overview 5-2-2 Setup and Operation Page Figure 5-2-1 Synchronous Serial Interface Transmission Timing (falling edge) Figure 5-2-2 Synchronous Serial Interface Transmission Timing (rising edge) Page Figure 5-2-3 Synchronous Serial Interface Reception Timing (reception at rising edge) Figure 5-2-4 Synchronous Serial Interface Reception Timing (reception at falling edge) SC0LNG2 to 0 012345670 Synchronous Serial Interface 5-2-3 Serial Interface Transfer Timing Page 5-3 Half-duplex UART Serial Interface 5-3-1 Overview 5-3-2 Setup and Operation Page Page Figure 5-3-2 UART Reception Timing Half-duplex UART Serial Interface 5-3-3 How to Use the Baud Rate Timer Transfer Speed 4.0 fosc (MHz) (bps) 5-4 Serial Interface Control Registers 5-4-1 Overview 7 registers control the serial interface. See table 5-4-1. Table 5-4-1 Serial Interface Registers 5-4-2 Transmit/Receive Shift Registers, Receive Data Buffer 5-4-3 Serial Interface Mode Registers (1) Serial interface 0 mode register (SC0MD0) Figure 5-4-3 Serial Interface 0 Mode Register 0 (SC0MD0: X'03F50', R/W) (2) Serial interface 0 mode register 1 (SC0MD1) Figure 5-4-4 Serial Interface 0 Mode Register 1 (SC0MD1: X'03F51', R/W) 110 (3) Serial interface 0 mode register 2 (SC0MD2) Figure 5-4-5 Serial Interface 0 Mode Register 2 (SC0MD2: X'03F52', R/W) (4) Serial interface 0 mode register 3 (SC0MD3) Figure 5-4-6 Serial Interface 0 Mode Register 3 (SC0MD3: X'03F53', R/W) 5-4-4 Serial Interface Control Register (1) Serial interface 0 control register (SC0CTR) Page 114 6-1 Overview Figure 6-1-1 A/D Converter Block Diagram 6-2 A/D Conversion 116 6-3 A/D Converter Control Registers 6-3-1 Overview 118 6-3-2 A/D Control Register (ANCTR) Figure 6-3-1 A/D Control Register 0 (ANCTR0: X'03F90', R/W) This readable and writable 8-bit register controls the operation of the A/D converter. (1) A/D control register 0 (ANCTR0) (2) A/D conversion control register 1 (ANCTR1) Figure 6-3-2 A/D Control Register 1 (ANCTR1: X'03F91', R/W) 120 6-3-3 A/D Buffers (ANBUF) Page Chapter 7 AC Zero-Cross Circuit/Noise Filter 122 7-1 Overview Figure 7-1-1 P21 Input Circuit Block Diagram 7-2 AC Zero-Cross Circuit Operation 7-2-1 Setup and Operation Chapter 7 AC Zero-Cross Circuit/Noise Filter 7-3 Noise Filter Noise Filter 7-3-1 Overview fs/2 Figure 7-3-1 Noise Filtering Circuit Block Diagram 7-3-2 Example Input and Output Waveforms for Noise Filter 7-4 AC Zero-Cross Control Register 7-4-1 Overview Four registers control the AC zero-cross circuit. Table 7-4-1 AC Zero-Cross Control Register 7-4-2 Noise Filter Control Register (NFCTR) This 6-bit readable and writable register controls the noise filter. Figure 7-4-1 Noise Filter Control Register (NFCTR: X'03F8A', R/W) Page Page 8-1 EPROM Versions 8-1-1 Overview 8-1-2 Cautions on Use 8-1-3 Erasing Written Data in Windowed Packages (PX-AP101C11-SDC, PX-AP101C11-FBC) 8-1-4 Characteristics of EPROM Version 8-1-5 Writing to Microcomputer with Internal EPROM Fit in the writing adapter and position the No.1 pin. Figure 8-1-1 Mount on the writing adapter and position of No.1 pin. Page 8-1-6 Cautions on Operating the ROM Writer 8-1-7 Option Bit Page Page Page 8-2 Instruction Set 1010DnDm 1 d8 sign extended 2 d4 zero extended 3 d8 zero extended 4A=An, a=Am 5 #8 sign extended 6 #8 zero extended 142 1101 111a <#16 .... .... ...> 9 mn <#8. ...> 1D=DWn, d=DWm 2 A=An, a=Am 3d=DWm 4D=DWk 1 d4 sign extended 2 d7 sign extended 3 d11 sign extended 144 1 d4 sign extended 2 d7 sign extended 3 d11 sign extended 2 d11 sign extended 4 d16 sign extended 5 aa=abs18.17 16 1 d7 sign extended 3 d12 sign extended Page Page Page Page Page Page Page Page Page Page Semiconductor Company Matsushita Electronics Corporation CANADA SALES OFFICE GERMANY SALES OFFICE U.K. SALES OFFICE SALES OFFICES HONG KONG SALES OFFICE TAIWAN SALES OFFICE SINGAPORE SALES OFFICE MALAYSIA SALES OFFICE