参数资料
型号: MC68HC705SR3PE
厂商: Freescale Semiconductor
文件页数: 90/96页
文件大小: 0K
描述: IC MCU 3.75K 2.1MHZ OTP 40-DIP
标准包装: 9
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 4MHz
外围设备: LED,POR
输入/输出数: 32
程序存储器容量: 3.75KB(3.75K x 8)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
Freescale
A-4
MC68HC05SR3
MC68HC705SR3
A
CLR
PCR
;reset PCR
LDX
#$00
;load index register with 00
BSET
1,PCR
;set ELAT bit
LDA
#$00
;load data = 00 in to A
STA
$1900,X
;latch data and address
BSET
0,PCR
;program
JSR
DELAY
;call delay subroutine for 1ms
CLR
PCR
;reset PCR
A.5
Mask Option Register (MOR)
The Mask Option Register (MOR) contains programmable EPROM bits to control mask options,
and cannot be changed in User mode. The erased state are zeros. This register is latched upon
reset going away.
SMD — SLOW Mode at Power-on
When programmed to “1”, this bit enables SLOW mode at power-up. Operating frequency,
fOP=fOSC÷2÷16=fOSC÷32.
SEC — EPROM Security
When programmed to “1”, this bit disables some functions of the Bootstrap mode, preventing
external reading of EPROM content.
TMR2:TMR0 — Power-on Reset Delay
The amount Power-On Reset delay is set by programming these three bits. The delay is selected
as follows:
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Mask Option Register (MOR)
$0FFF
SMD
SEC
TMR2 TMR1 TMR0
RC
unaffected
TMR2
TMR1
TMR0
Delay (Instruction Cycles)
00
0
256
00
1
512
0
1
0
1024
0
1
2048
1
0
4096
1
0
1
8192
1
0
16384
1
32768
TPG
88
05SR3.Book Page 4 Thursday, August 4, 2005 1:08 PM
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