參數(shù)資料
型號(hào)： GMS87C7216Q
廠商： Electronic Theatre Controls, Inc.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 44/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216Q
GMS81C7208/7216
40
FEB. 2005 Ver 1.04
12. BASIC INTERVAL TIMER
The GMS81C7208/16 has one 8-bit basic interval timer that is
free-run and can not stop. Block diagram is shown in Figure 12-1.
In addition, the basic tnterval timer generates the time base for
watchdog timer counting. It also provides a Basic interval timer
interrupt (BITIF). As the count overflow from FF
H
to 00
H
, this
overflow causes the interrupt to be generated. The basic interval
timer is controlled by the clock control register (CKCTLR)
shown in Figure 12-2.
Source clock can be selected by lower 3 bits of CKCTLR.
The registers BITR and CKCTLR are located at same address,
and address 0F9
H
is read as a BITR, and written to CKCTLR.
Figure 12-1 Block Diagram of Basic Interval Timer
Table 12-1 Basic Interval Timer Interrupt Time
MUX
Basic Interval Timer Interrupt
Select Input clock 3
Basic Interval Timer
clock control register
source
clock
8-bit up-counter
BTS[2:0]
BTCL
÷
8
÷
16
÷
1024
÷
512
÷
256
÷
128
÷
64
÷
32
To Watchdog timer (WDTCK)
CKCTLR
clear
overflow
Internal bus line
[0F4
H
]
[0F9
H
]
BITIF
Read
P
BITR
f
XIN
reserved
0X
1X
SCMR[1:0]
BTS[2:0]
CPU Source Clock
Interrupt (overflow) Period (ms)
@ f
XIN
= 4MHz
000
001
010
011
100
101
110
111
÷
8
÷
16
÷
32
÷
64
÷
128
÷
256
÷
512
÷
1024
0.512
1.024
2.048
4.096
8.192
16.384
32.768
65.536
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