参数资料
型号: M68HC05M68H
厂商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件页数: 36/130页
文件大小: 1541K
代理商: M68HC05M68H
Operating Modes
Advance Information
MC68HC705P6A
Rev. 2.0
36
Operating Modes
MOTOROLA
The mode of operation is also determined whenever the internal
computer operating properly (COP) watchdog timer resets the MCU.
When the COP timer expires, the voltage applied to the IRQ/V
PP
pin
controls the mode of operation while the voltage applied to PD7/TCAP is
ignored. The voltage applied to PD7/TCAP during the last rising edge on
RESET is stored in a latch and used to determine the mode of operation
when the COP watchdog timer resets the MCU.
3.3 User Mode
The user mode allows the MCU to function as a self-contained
microcontroller, with maximum use of the pins for on-chip peripheral
functions. All address and data activity occurs within the MCU and are
not available externally. User mode is entered on the rising edge of
RESET if the IRQ/V
PP
pin is within the normal operating voltage range.
The pinout for the user mode is shown in
Figure 3-1
.
Figure 3-1. User Mode Pinout
In the user mode, there is an 8-bit I/O port, a second 8-bit I/O port shared
with the analog-to-digital (A/D) subsystem, one 3-bit I/O port shared with
the serial input/output port (SIOP), and a 3-bit port shared with the 16-bit
timer subsystem, which includes one general-purpose I/O pin.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RESET
IRQ/V
PP
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
SDO/PB5
SDI/PB6
SCK/PB7
V
SS
V
DD
OSC1
OSC2
PD7/TCAP
TCMP
PD5
PC0
PC1
PC2
PC3/AD3
PC4/AD2
PC5/AD1
PC6/AD0
PC7/V
REFH
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