参数资料
型号: SAB-C515-L24N
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 24 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 96/162页
文件大小: 771K
代理商: SAB-C515-L24N
Semiconductor Group
5-3
Reset / System Clock
C515
5.2
Hardware Reset Timing
This section describes the timing of the hardware reset signal.
The input pin RESET is sampled once during each machine cycle. This happens in state 5 phase
2. Thus, the external reset signal is synchronized to the internal CPU timing. When the reset is
found active (low level) the internal reset procedure is started. It needs two complete machine
cycles to put the complete device to its correct reset state, i.e. all special function registers contain
their default values, the port latches contain 1's etc. Note that this reset procedure is also performed
if there is no clock available at the device. (This is done by the oscillator watchdog, which provides
an auxiliary clock for performing a perfect reset without clock at the XTAL1 and XTAL2 pins). The
RESET signal must be active for at least one machine cycle; after this time the C515 remains in its
reset state as long as the signal is active. When the signal goes inactive this transition is recognized
in the following state 5 phase 2 of the machine cycle. Then the processor starts its address output
(when configured for external ROM) in the following state 5 phase 1. One phase later (state 5 phase
2) the first falling edge at pin ALE occurs.
Figure 5-2 shows this timing for a configuration with EA = 0 (external program memory). Thus,
between the release of the RESET signal and the first falling edge at ALE there is a time period of
at least one machine cycle but less than two machine cycles.
Figure 5-2
CPU Timing after Reset
MCT01879
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
P1 P2
PCL
OUT
PCL
OUT
PCH
OUT
PCH
OUT
One Machine Cycle
RESET
P0
P2
ALE
IN
Inst.
相关PDF资料
PDF描述
SAF-C515-RM 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP80
SAF-C515-LN 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
SAH-C515-LN 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
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SAB-C515C-LM 8-BIT, 10 MHz, MICROCONTROLLER, PQFP80
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