參數(shù)資料
型號(hào): SST89E54RC-33-C-PIE
廠商: Microchip Technology
文件頁(yè)數(shù): 42/71頁(yè)
文件大?。?/td> 0K
描述: IC MCU 8BIT 17KB FLASH 40PDIP
標(biāo)準(zhǔn)包裝: 9
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,UART/USART
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25088A
10/11
47
FlashFlex MCU
SST89E52RC / SST89E54RC
Data Sheet
A Microchip Technology Company
Boot Sequence
After Power On Reset, the device can boot from one of three locations: zero, default boot vector (see
Table 12), or a user-defined boot vector. The checking sequence follows the flowchart in Figure 12. If
the device uses external code memory (EA#=0), the boot-start address is always zero. The next
sequence is to detect any external hardware pin setup.
The device should check P1[0] and P1[1] at the falling edge of reset. (See Figure 13 for the timing dia-
gram.) If both pins are low, the device is forced to boot from either the default boot vector or the user-
defined boot vector depending on the setting of Boot_From_User_Vector_i. The Boot_Status_Flag bit
(HWIAP) in the SFCF register indicates whether or not the system booted with P1[0] and P1[1] set to
low during reset. (See Section , “Special Function Registers” on page 11 for details.)
Programming the control bits (Boot_From_User_Vector_i and Boot_From_Zero_i) can be done
through IAP mode commands or External Host Mode commands. The factory default setting for these
two bits is “1” and will lead the system to boot from the default boot vector per Table 12.
When the device is configured to boot from a user-defined vector, users should use the
Set_User_Boot_Vector command to program the Boot Vector[7:0]. The final boot vector address is cal-
culated in Table 17.
Table 17:Boot Vector Address
Device
Bit Number
15
14
13
12
11
10
9876543210
SST89E54RC
0
Boot Vector[7:0]
000000
SST89E52RC
0
Boot Vector[7:0]
0
T0-0.1 25008
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