参数资料
型号: SAB-C167CS-LMCA
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 16-BIT, 25 MHz, MICROCONTROLLER, PQFP144
封装: PLASTIC, MQFP-144
文件页数: 55/84页
文件大小: 1082K
代理商: SAB-C167CS-LMCA
C167CS-4R
C167CS-L
Data Sheet
55
V2.2, 2001-08
AC Characteristics
Definition of Internal Timing
The internal operation of the C167CS is controlled by the internal CPU clock
fCPU. Both
edges of the CPU clock can trigger internal (e.g. pipeline) or external (e.g. bus cycles)
operations.
The specification of the external timing (AC Characteristics) therefore depends on the
time between two consecutive edges of the CPU clock, called “TCL” (see Figure 11).
Figure 11
Generation Mechanisms for the CPU Clock
The CPU clock signal
fCPU can be generated from the oscillator clock signal fOSC via
different mechanisms. The duration of TCLs and their variation (and also the derived
external timing) depends on the used mechanism to generate
fCPU. This influence must
be regarded when calculating the timings for the C167CS.
Note: The example for PLL operation shown in Figure 11 refers to a PLL factor of 4.
The used mechanism to generate the basic CPU clock is selected by bitfield CLKCFG
in register RP0H.7-5.
Upon a long hardware reset register RP0H is loaded with the logic levels present on the
upper half of PORT0 (P0H), i.e. bitfield CLKCFG represents the logic levels on pins
MCT04338
f
OSC
f
CPU
Phase Locked Loop Operation
TCL
f
OSC
f
CPU
Direct Clock Drive
f
OSC
f
CPU
Prescaler Operation
TCL
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