Freescale Semiconductor DEMO9S08DZ60 Demo Board DEMO9S08DZ60 DEMO9S08DZ60 数据表
产品代码
DEMO9S08DZ60
Chapter 15 Real-Time Counter (S08RTCV1)
MC9S08DZ60 Series Data Sheet, Rev. 4
312
Freescale Semiconductor
15.1.4
Block Diagram
The block diagram for the RTC module is shown in
Figure 15-2. Real-Time Counter (RTC) Block Diagram
15.2
External Signal Description
The RTC does not include any off-chip signals.
15.3
Register Definition
The RTC includes a status and control register, an 8-bit counter register, and an 8-bit modulo register.
Refer to the direct-page register summary in the memory section of this document for the absolute address
assignments for all RTC registers.This section refers to registers and control bits only by their names and
relative address offsets.
assignments for all RTC registers.This section refers to registers and control bits only by their names and
relative address offsets.
is a summary of RTC registers.
Table 15-1. RTC Register Summary
Name
7
6
5
4
3
2
1
0
RTCSC
R
RTIF
RTCLKS
RTIE
RTCPS
W
RTCCNT
R
RTCCNT
W
RTCMOD
R
RTCMOD
W
Clock
Source
Select
Prescaler
Divide-By
8-Bit Counter
(RTCCNT)
8-Bit Modulo
(RTCMOD)
8-Bit Comparator
RTIF
RTIE
Background
V
DD
RTC
Interrupt
Request
Request
D
Q
R
E
LPO
RTC
Clock
Mode
ERCLK
IRCLK
RTCLKS
Write 1 to
RTIF
RTCPS
RTCLKS[0]