Panasonic MN101C77C Oscillation Stabilization Wait time, Nrst Stop, Dlyctr, Wdctr, MUX Wdirq

Models: F77G MN101C77C

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Chapter 2 CPU Basics

2-8-2 Oscillation Stabilization Wait time

Oscillation stabilization wait time is the period from the stop of oscillation circuit to the stablization for oscillation. Oscillation stabilization wait time is automatically inserted at releasing from reset and at recovering from STOP mode. At recovering from STOP mode the oscillation stabilization wait time con- trol register (DLYCTR) is set to select the oscillation stabilization wait time. At releasing from reset, oscillation stabilization wait time is fixed.

The timer that counts oscillation stabilization wait time is also used as a watchdog timer. That is used as a runaway detective timer at anytime except at releasing from reset and at recovering from STOP mode. Watchdog timer is initiated at reset and at STOP mode and starts counting from the initialize value (x'0000') when system clock (fs) is as clock source. After oscillation stabilization wait time, it continues

counting as a watchdog timer.

[

Chapter 9 Watchdog timer ]

„Block Diagram of Oscillation Stabilization Wait Time (watchdog timer)

NRST

STOP

writeWDCTR

HALT fs

(sysclk)

DLYCTR

-

DLYS0

DLYS1

DLYS2

BUZS0

BUZS1

0

R

R

1/2 to 1/214

1/215 to 1/220

 

 

fs/214

fs/212 fs/210

fs/28 MUX fs/26

fs/24 fs/22

R

S

internal reset release

BUZS2

BUZOE

WDCTR

WDEN

WDTS0

WDTS1

WDTC0

WDTC1

WDTC2

-

-

7

0

7

fs/222

 

 

 

 

 

 

 

fs/220

 

 

MUX

WDIRQ

 

fs/218

 

 

 

fs/216

 

 

 

 

 

 

 

Figure 2-8-3 Block Diagram of Osillation Stabilization Wait Time (watchdog timer)

II - 40 Reset

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Panasonic MN101C77C, F77G user manual Oscillation Stabilization Wait time, Nrst Stop, Dlyctr, Wdctr, MUX Wdirq