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参数资料
| 型号： | MC68HC05SU3AFB |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 62/80页 |
| 文件大小： | 328K |
| 代理商： | MC68HC05SU3AFB |
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MC68HC05SU3A
MOTOROLA
9-1
OPERATING MODES
9
OPERATING MODES
The MC68HC05SU3A has two modes of operation: the User Mode and the Self-Check Mode.
Table 9-1 shows the conditions required for entering the two operating modes.
9.1
User Mode
The normal operating mode of the MC68HC05SU3A is the User mode. This mode is entered on
the rising edge of RESET when the VPP and PB1 pins are between VSS and VDD.
9.2
Self-Check Mode
The Self-check mode is provided on the MC68HC05SU3A for the user to check device functions
with an on-chip self-check program masked at location $1F00 to $1FEF under minimum hardware
support. The self-check schematic is shown in Figure 9-1. Self-check mode is entered on the
rising edge of RESET when the VPP pin is at VTST (2×VDD) and PB1 pin is at VDD. Once in the
self-check mode, PB1 can then be used for other purposes. After entering the self-check mode,
CPU branches to the self-check program and carries out the self-check. Self-check is a repetitive
test, i.e. if all parts are checked to be good, the CPU will repeat the self-check again. Therefore,
the LEDs attached to Port A will be ashing if the device is good; else the combination of LEDs’
on-off pattern can show what part of the device is suspected to be bad. Table 9-2 lists the LEDs’
on-off patterns and their corresponding indications.
Table 9-1 Mode Selection
RESET
VPP
PB1
MODE
VSS to VDD
USER
VTST
VDD
SELF-CHECK
VTST=2×VDD
5V
TPG
63
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