
ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 7 Time Base Counter
7-1
7. Time Base Counter
7.1 Overview
This LSI includes a low-speed time base counter (LTBC) and a high-speed time base counter (HTBC) that generate base
clocks for peripheral circuits. By using the time base counter, it is possible to generate events periodically.
For input clocks, see Chapter 6, “Clock Generation Circuit”. For interrupt permission, interrupt request flags, etc.,
described in this chapter, see Chapter 5, “Interrupt”.
7.1.1 Features
•
LTBC generates T32KHZ to T1HZ signals by dividing the low-speed clock (LSCLK) frequency.
•
LTBC allows frequency adjustment (Adjustment range: Approx. -488ppm to +488ppm. Adjustment accuracy:
Approx. 0.48ppm) by using the low-speed time base counter frequency adjustment registers (LTBADJH and
LTBADJL).
•
HTBC generates HTB1 to HTB32 signals by dividing the high-speed clock (HSCLK) frequency.
•
Capable of generating 128Hz , 32Hz , 16Hz , and 2Hz interrupts.
7.1.2 Configuration
Figure 7-1 and Figure 7-2 show the configuration of a low-speed time base counter and a high-speed time base counter,
respectively.
LTBR
: Low-speed time base counter register
LTBADJL : Low-speed time base counter frequency adjustment register
LTBADJH : Low-speed time base counter frequency adjustment register
Figure 7-1 Configuration of Low-Speed Time Base Counter (LTBC)
LSCLK
(32.768kHz)
7bits-Counter
R
LTBR
8bits-Counter
R
RESET
(Internal signal)
LTBR Write
LTBADJL
LTBDJH
8
Data bus
T2HZ
T4HZ
T8HZ
T16HZ
T32HZ
T64HZ
T128HZ
T256HZ
T512HZ
T1KHZ
T2KHZ
T4KHZ
T8KHZ
T16KHZ
T32KHZ
T1HZ
8
Содержание ML610471
Страница 12: ...Chapter 1 Overview...
Страница 38: ...Chapter 2 CPU and Memory Space...
Страница 44: ...Chapter 3 Reset Function...
Страница 48: ...Chapter 4 MCU Control Function...
Страница 62: ...Chapter 5 Interrupts...
Страница 82: ...Chapter 6 Clock Generation Circuit...
Страница 94: ...Chapter 7 Time Base Counter...
Страница 105: ...Chapter 8 Capture...
Страница 114: ...Chapter 9 Timer...
Страница 133: ...Chapter 10 Watchdog Timer...
Страница 141: ...Chapter 11 UART...
Страница 164: ...Chapter 12 Port 0...
Страница 173: ...Chapter 13 Port 2...
Страница 180: ...Chapter 14 Port 3...
Страница 188: ...Chapter 15 Port 4...
Страница 199: ...Chapter 16 Port 6...
Страница 205: ...Chapter 17 RC Oscillation Type A D Converter...
Страница 225: ...Chapter 18 LCD Drivers...
Страница 243: ...Chapter 19 Power Supply Circuit...
Страница 245: ...Chapter 20 uEASE Flash Writer System...
Страница 249: ...Chapter 21 Software Development...
Страница 258: ...Appendixes...
Страница 280: ...Revision History...