參數(shù)資料
型號: SAK-C505L
廠商: INFINEON TECHNOLOGIES AG
元件分類: 8位微控制器
英文描述: 8-bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁數(shù): 41/85頁
文件大小: 487K
代理商: SAK-C505L
C505L
Data Sheet
39
06.99
Real-Time Clock
The real-time clock unit of the C505L contains a dedicated oscillator and a 47-bit timer which is used
to count time elapsed with respect to an initial time. The C505L real-time clock does not provide for
any error correction. Any such corrections can be done by software only.
Functionality
The real-time clock can be initialized to a 40-bit initial value, which are loaded into the upper 40-bits
of the timer. The lower 7 bits of the counter are never accessible by the user and merely act as
prescalers that are initialized to 0000000
B
after a start operation on the real-time clock. One
increment of the clock register is made for every cycle of the input clock (32.768 kHz). The
functionality of the real-time clock is shown in
Figure 18
.
Figure 18
Real-Time Clock
The register memory for the real-time clock is implemented in the on-chip external data memory
area. Accesses to these registers are similar to on-chip XRAM accesses (MOVX instructions) and
therefore must be preceded by an enable operation on the on-chip XRAM. These registers include
the RTCON, RTCR0 to RTCR4 (RTCR), CLREG0 to CLREG4 (CLREG) and RTINT0 to RTINT4
(RTINT) registers.
Control
ERTC
RTINT, 40-Bit Register
40-Bit Comparator
CLREG, 40-Bit Timer
RTCR, 40-Bit Register
MCS03865
LSB
MSB
Bit 0
Bit 6
OSC.
IRTC
32.768 KHz
Input
These bits are not readable.
Wake - up
Request
RTCS
7-Bit Timer
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