参数资料
型号: MC68HC05J5ADWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 68/106页
文件大小: 1069K
代理商: MC68HC05J5ADWR2
GENERAL RELEASE SPECIFICATION
July 16, 1999
MOTOROLA
16-BIT TIMER
MC68HC05J5A
9-6
REV 2.1
Figure 9-7. Timer1 Capture Control Register
TCAPS — Timer Input Capture Comparator Enable
1 =
Timer input capture comparator is selected.
0 =
Timer input capture comparator schmitt trigger is selected.
NOTE
When the comparator and VDD/2 reference are enabled, PB0 pin will automatically
becomes an input pin, irrespective of DDR setting. However, it is recommended to
set PB0 as an input rst (via DDR), before enabling the comparator. A read of PB0
will reect the TCAP pin status, not the PB0 register bit.
The comparator uses the VDD/2 reference as the compare voltage, resulting in a
typical output as shown in Figure 9-9.
Switching off the VDD/2 voltage reference by clearing TCAPS=0 will further save
power when the MCU is in a low power mode.
Figure 9-8. TCAP Input Signal Conditioning
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
T1CC
R
TCAPS
$0002
W
reset:
00000000
+
MUX
PB0/
TCAP
Voltage
Reference
VREF
EN
PB0 I/O
PORT LOGIC
TCAPS bit
VDD ÷ 2
Schmitt Trigger
Comparator
To edge select and
detect logic
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