參數(shù)資料
型號: 9202
廠商: 意法半導體
英文描述: Flash Programmable System Devices with 8032 Microcontroller Core
中文描述: 閃存可編程系統(tǒng)設備與8032微控制器內核
文件頁數(shù): 85/175頁
文件大小: 1731K
代理商: 9202
85/175
UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
Table 62. SWNEB Bit Function
SWENB
DDC1 or DDC2b Mode Disabled
DDC1 or DDC2b Mode Enabled
DDCCON.bit2 = 0 (DDC1 Mode Disable) or
S1CON.bit6 = 0 (I
2
C Mode Disable)
DDCCON.bit2 = 1 (DDC1 Mode Enable) or
S1CON.bit6 = 1 (I
2
C Mode Enable)
0
In this state, the DDC unit is disabled. The DDC
SRAM cannot be accessed by the MCU. No MCU
interrupt and no DDC activity will occur.
MCU cannot access internal DDC SRAM: DDC
SRAM address space is re-assigned to external
data space.
In this state, the DDC is enabled and the unit is in
automatic mode. The DDC SRAM cannot be
accessed by the MCU – only the DDC unit has
access.
MCU cannot access internal DDC SRAM: data
space FF00h-FFFFh is dedicated to DDC SRAM.
1
In this state, the DDC unit is disabled, BUT with
SWENB=1, the MCU can access the SRAM. This
state is used to load the DDC SRAM with the
correct data for automatic modes. No MCU
interrupt and no DDC activity will occur.
MCU can access DDC SRAM: data space FF00h-
FFFFh is dedicated to DDC SRAM.
In this state, the DDC SRAM can be accessed by
the MCU. The DDC unit does not use the DDC
SRAM when SWENB=1. Since the DDC unit is in
manual mode, the DDC unit generates an MCU
interrupt for each byte transferred. The byte
transferred is held in the I
2
C S1DAT SFR register.
MCU can access DDC SRAM.
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