MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 176

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(2) Watchdog timer enable register (WDTE)
174
Address: FF99H
Symbol
WDTE
Writing ACH to WDTE clears the watchdog timer counter and starts counting again.
This register can be set by an 8-bit memory manipulation instruction.
RESET input sets this register to 9AH.
Cautions 1. If data is written to WDTM, a wait cycle is generated. For details, see CHAPTER 27
Remarks 1. f
Cautions 1. If a value other than ACH is written to WDTE, an internal reset signal is generated.
7
After reset: 9AH
2. Set bits 7, 6, and 5 to 0, 1, and 1, respectively (when “Internal low-speed oscillator
3. After reset is released, WDTM can be written only once by an 8-bit memory
4. WDTM cannot be set by a 1-bit memory manipulation instruction.
2. f
3. : Don’t care
4. Figures in parentheses apply to operation at f
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset
3. The value read from WDTE is 9AH (this differs from the written value (ACH)).
Figure 9-3. Format of Watchdog Timer Enable Register (WDTE)
RL
XP
CAUTIONS FOR WAIT.
cannot be stopped” is selected by an option byte, other values are ignored).
manipulation instruction. If writing attempted a second time, an internal reset signal
is generated.
signal is generated.
: Internal low-speed oscillation clock oscillation frequency
: X1 input clock oscillation frequency
6
R/W
5
CHAPTER 9 WATCHDOG TIMER
User’s Manual U17890EJ2V0UD
4
3
RL
= 240 kHz (TYP.), f
2
1
XP
= 20 MHz
0