參數(shù)資料
型號(hào): UPD78F9212CS-CAB-A
廠商: Renesas Electronics America
文件頁數(shù): 60/175頁
文件大?。?/td> 0K
描述: MCU 8BIT 4KB FLASH 16PIN
標(biāo)準(zhǔn)包裝: 400
系列: 78K0S/Kx1+
核心處理器: 78K0S
芯體尺寸: 8-位
速度: 10MHz
外圍設(shè)備: LVD,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 托盤
CHAPTER 8 WATCHDOG TIMER
User’s Manual U16994EJ6V0UD
150
Cautions 2. After reset is released, WDTM can be written only once by an 8-bit memory
manipulation instruction.
If writing is attempted a second time, an internal reset
signal is generated. However, at the first write, if “1” and “x” are set for WDCS4 and
WDCS3 respectively and the watchdog timer is stopped, then the internal reset
signal does not occur even if the following are executed.
Second write to WDTM
1-bit memory manipulation instruction to WDTE
Writing of a value other than “ACH” to WDTE
3. WDTM cannot be set by a 1-bit memory manipulation instruction.
4. When using the flash memory programming by self programming, set the overflow
time for the watchdog timer so that enough overflow time is secured (Example 1-
byte writing: 200
μs MIN., 1-block deletion: 10 ms MIN.).
Remarks 1. fRL: Low-speed internal oscillation clock oscillation frequency
2. fX: System clock oscillation frequency
3.
×: Don’t care
4. Figures in parentheses apply to operation at fRL = 480 kHz (MAX.), fX = 10 MHz.
(2) Watchdog timer enable register (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 signal generation sets this register to 9AH.
Figure 8-3. Format of Watchdog Timer Enable Register (WDTE)
0
1
2
3
4
5
6
7
Symbol
WDTE
Address: FF49H
After reset: 9AH
R/W
Cautions 1. If a value other than ACH is written to WDTE, an internal reset signal is generated.
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset
signal is generated.
3. The value read from WDTE is 9AH (this differs from the written value (ACH)).
相關(guān)PDF資料
PDF描述
UPD78F9222CS-CAC-A MCU 8BIT 4KB FLASH 20PIN
UPD78F9234CS-CAA-A MCU 8BIT 8KB FLASH 30PIN
UPD78F9418AGC-8BT-A IC MCU 8BIT 32K FLASH 80QFP
USB-232-DIL IC USB ASYNC SRL UART 28-DIL
USB-DAQ-DIL IC SYSTEM DATA LOGGER 28-DIL
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD78F9212FH(T)-2A2-A 制造商:Renesas Electronics Corporation 功能描述:
UPD78F9212FH-2A2-A 制造商:Renesas Electronics Corporation 功能描述:
UPD78F9212FH-2A2-E1-A 制造商:Renesas Electronics Corporation 功能描述:
UPD78F9212GR(T)-JJG 制造商:Renesas Electronics Corporation 功能描述: 制造商:NEC Electronics Corporation 功能描述: 制造商:NEC Electronics Corporation 功能描述:8-BIT, FLASH, 10 MHz, MICROCONTROLLER, PDSO16
UPD78F9212GR(T)-JJG-A 制造商:NEC Electronics Corporation 功能描述:8BIT MCU 4K FLASH 128B RAM 78F9212