參數(shù)資料
型號: MC16V1CPU20B1
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝: TQFP-100
文件頁數(shù): 84/128頁
文件大小: 571K
代理商: MC16V1CPU20B1
MC68HC16V1
MOTOROLA
MC68HC16V1TS/D
59
3.9 Chip-Selects
Typical microcontrollers require additional hardware to provide external chip-select and address de-
code signals. This MCU provides three independently programmable chip selects, CSA, CSB, and
CSC, that provide bus timing and bus cycle termination for external memory and peripheral devices.
Each chip-select has its own base address register (CSBARA, CSBARB, CSBARC) and its own option
register (CSORA, CSORB, CSORC). These registers contain the programmable characteristics of a
particular chip-select. Figure 14 displays a block diagram of a programmable chip-select circuit.
Figure 14 Chip-Select Block Diagram
V1 CHIP SEL BLOCK
OPTION COMPARE AND TIMING GENERATION
OPTION REGISTER
MODE
BYTE
R/W
STRB
DTACK
SPACE
IPL
IACK
IDLE
R/W
ADDR[4:0]
SIZ[1:0]
AS
DS
FC[2:0]
CLK
SYNC
AVEC
DTACK WAIT STATES
DATA[15:0]
ADDR[23:11]
ADDRESS COMPARE
BASE ADDRESS REGISTER
PIN
CONTROL
CONTROL REGISTER
PORT
SIZE
IACK
RESP
RWEN
CHIP SELECT
PORT D OUTPUT
TO INTERNAL
DTACK GENERATOR
ADDRESS MATCH
OPTION MATCH
STROBE TIMING
CS START
IMB
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