參數(shù)資料
型號: S1C63653F
元件分類: 微控制器/微處理器
英文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, CQFP100
封裝: CERAMIC, QFP15-100
文件頁數(shù): 105/121頁
文件大小: 1127K
代理商: S1C63653F
76
EPSON
S1C63653 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Programmable Timer)
(6) For the reason below, pay attention to the reload data write timing when changing the interval of the
programmable timer interrupts while the programmable timer is running.
The programmable timer counts down at the falling edge of the input clock and at the same time it
generates an interrupt if the counter underflows. Then it starts loading the reload data to the counter
and the counter data is determined at the next rising edge of the input clock (period shown in as in
the figure).
Input clock
Counter data
(continuous mode)
(Reload data = 25H)
03H
02H
01H
00H
25H
24H
Counter data is determined by reloading.
Underflow (interrupt is generated)
Fig. 4.10.10.2 Reload timing for programmable timer
To avoid improper reloading, do not rewrite the reload data after an interrupt occurs until the counter
data is determined including the reloading period . Be especially careful when using the OSC1 (low-
speed clock) as the clock source of the programmable timer and the CPU is operating with the OSC3
(high-speed clock).
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