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Section 9 Timer
9.1
Overview
The timer in the HD64465 provides two channels of programmable counters. Interrupt requests are
generated whenever the counter reaches zero. In order to reduce power consumption, clock pre-
scaled circuit and STANDBY mode are added.
Two-channel pulse width modulation (PWM) functions are also provided for VR control of
LCD. The PWM cycle is programmable by setting high pulse cycle and low pulse cycle.
9.1.1
Features
•
Two channels programmable down-count timer
•
16-bit counter
•
The counter is loaded with 16-bit constant registers and can be read or written to at any
moment
•
The counter constant is auto-reloaded when reaching zero
•
Supports binary counting
•
Supports START/STOP counting
•
The input frequency of timer can be pre-scaled, the options are: 1, 1/4, 1/8, 1/16
•
Generates interrupt output timer1r/timer0r to interrupt controller INTC when counter reaches
zero
•
Supports STANDBY mode, which is able to stop the clock operation of the timer
•
Provides DMA request enable function, and DREQ1# is used (timer1)
•
Provides A/D trigger signal ADTRIG# enable function (timer0)
•
Provides timer output signal TMO1# and TMO0# options
•
Two channels PWM
•
16-bit high pulse width counter and low pulse width counter for each channel
•
Programmable PWM cycle
•
Six clock scales (1, 1/2, 1/4, 1/8, 1/16, 1/32) with respect to CKIO are supported for pulse
width counting
Содержание HD64465
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