參數(shù)資料
型號(hào)： MC68HC05E16CFU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM
中文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁(yè)數(shù)： 71/96頁(yè)
文件大?。?/td> 3045K
代理商： MC68HC05E16CFU
MC68HC05SR3
Freescale
10-1
OPERATING MODES
10
OPERATING MODES
The MC68HC05SR3/MC68HC705SR3 has two modes of operation: the User Mode and the
Self-Check/Bootstrap Mode. Table 10-1 shows the conditions required for entering the two
operating modes.
10.1
User Mode
The normal operating mode of the MC68HC05SR3/MC68HC705SR3 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.
10.2
Self-Check Mode
The Self-check mode is provided on the MC68HC05SR3 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 10-1. 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 flashing 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 10-2 lists the LEDs’
on-off patterns and their corresponding indications.
Table 10-1 Mode Selection
RESET
VPP
PB1
MODE
VSS to VDD
USER
VTST
VDD
SELF-CHECK/BOOTSTRAP
VTST=2×VDD
5V
TPG
71
05SR3.Book Page 1 Thursday, August 4, 2005 1:08 PM
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