参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 89/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
4-4
External Bus Interface
C515
4.4
ALE, Address Latch Enable
The C515 allows to switch off the ALE output signal. If the internal ROM is used (EA=1 and
PC
1FFFH) and ALE is switched off by EALE=0, then, ALE will only go active during external data
memory accesses (MOVX instructions). If EA=0, the ALE generation is always enabled and the bit
EALE has no effect.
After a hardware reset the ALE generation is enabled.
Special Function Register SYSCON (Address B1H)
Reset Value : XX1XXXXXB
Note: The ALE swicth-off feature is available in C515-LM/1RM versions only. In case of the
C515-LN/1RN versions, the SYSCON register is present without function.
Bit
Function
EALE
Enable ALE output
EALE = 0 :
ALE generation is disabled; disables ALE signal generation
during internal code memory accesses (EA=1). With EA=1,
ALE is automatically generated at MOVX instructions.
EALE = 1 :
ALE generation is enabled
If EA=0, the ALE generation is always enabled and the bit EALE has no
effect on the ALE generation.
Reserved bits for future use, read by CPU returns undefined values.
76543210
EALE
B1H
SYSCON
Bit No.
MSB
LSB
––
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