參數(shù)資料
型號(hào): MC68HC705C9AVFNE
廠商: Freescale Semiconductor
文件頁數(shù): 52/118頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 352 BYTES RAM 44-PLC
標(biāo)準(zhǔn)包裝: 26
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 2.1MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 24
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類型: OTP
RAM 容量: 352 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
39
Chapter 5
Resets
5.1 Introduction
The MCU can be reset four ways: by the initial power-on reset function, by an active low input to the
RESET pin, by the COP, or by the clock monitor. A reset immediately stops the operation of the instruction
being executed, initializes some control bits, and loads the program counter with a user-defined reset
vector address. Figure 5-1 is a block diagram of the reset sources.
Figure 5-1. Reset Sources
5.2 Power-On Reset (POR)
A power-on-reset occurs when a positive transition is detected on VDD. The power-on reset is strictly for
power turn-on conditions and should not be used to detect a drop in the power supply voltage. There is a
4064 internal processor clock cycle (tcyc) oscillator stabilization delay after the oscillator becomes active.
(When configured as a C9A, the RESET pin will output a logic 0 during the 4064-cycle delay.) If the
RESET pin is low after the end of this 4064-cycle delay, the MCU will remain in the reset condition until
RESET is driven high externally.
5.3 RESET Pin
The function of the RESET pin is dependent on whether the device is configured as an MC68HC05C9A
or an MC68HC05C12A. When it is in the MC68HC05C12A configuration, the pin is input only. When in
MC68HC05C9A configuration the pin is bidirectional. In both cases the MCU is reset when a logic 0 is
applied to the RESET pin for a period of one and one-half machine cycles (t
RL
). For the MC68HC05C9A
configuration, the RESET pin will be driven low by a COP, clock monitor, or power-on reset.
VDD
RESET
LATCH
POWER-ON RESET
D
INTERNAL CLOCK
R
RST
TO CPU AND
SUBSYSTEMS
Q
STOP
CLOCK MONITOR
COP WATCHDOG
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