MC9S08DZ60CLH Datasheet, PDF (312/416 Pages) Freescale Semiconductor, Inc – MC9S08DZ60 Series Features

Chapter 15 Real-Time Counter (S08RTCV1)
15.1.4 Block Diagram
The block diagram for the RTC module is shown in Figure 15-2.
LPO
ERCLK
IRCLK
Clock
Source
Select
Background
Mode
RTCLKS
RTCLKS[0]
RTCPS
Prescaler
Divide-By
RTC
Clock
8-Bit Modulo
V_DD
(RTCMOD)
DQ
RTIF
8-Bit Comparator
8-Bit Counter
(RTCCNT)
E
R
Write 1 to
RTIF
RTIE
Figure 15-2. Real-Time Counter (RTC) Block Diagram
15.2 External Signal Description
The RTC does not include any off-chip signals.
RTC
Interrupt
Request
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.
Table 15-1 is a summary of RTC registers.
Table 15-1. RTC Register Summary
Name
RTCSC
RTCCNT
RTCMOD
7
6
5
4
3
2
1
0
R
RTIF
W
RTCLKS
RTIE
RTCPS
R
RTCCNT
W
R
RTCMOD
W
MC9S08DZ60 Series Data Sheet, Rev. 4
312
Freescale Semiconductor