參數(shù)資料
型號: S1C88848D0A0100
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝: DIE-192
文件頁數(shù): 170/174頁
文件大?。?/td> 1304K
代理商: S1C88848D0A0100
S1C88848 TECHNICAL MANUAL
EPSON
87
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Programmable Timer)
(5) When the 16-bit mode has been selected, be sure
to read the counter data in the order of PTD0
and PTD1 (PTD2 and PTD3). Moreover, the
time interval between reading PTD0 and PTD1
(PTD2 and PTD3) should be 0.73 msec or less.
(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
Underflow (interrupt is generated)
Counter data is determined by reloading
Fig. 5.10.11.2 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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