參數(shù)資料
型號(hào)： CY7C63813
廠商： Cypress Semiconductor Corp.
英文描述： enCoRe II Low-Speed USB Peripheral Controller(enCoRe II低速USB外設(shè)控制器)
中文描述： enCoRe II還低速USB外設(shè)控制器（enCoRe II還低速的USB外設(shè)控制器）
文件頁(yè)數(shù)： 14/74頁(yè)
文件大?。?/td> 1441K
代理商： CY7C63813
CY7C63310
CY7C638xx
Document 38-08035 Rev. *I
Page 14 of 74
Two important variables that are used for all functions are
KEY1 and KEY2. These variables are used to help discrim-
inate between valid SSCs and inadvertent SSCs. KEY1 must
always have a value of 3Ah, while KEY2 must have the same
value as the stack pointer when the SROM function begins
execution. This would be the Stack Pointer value when the
SSC opcode is executed, plus three. If either of the keys do
not match the expected values, the M8C will halt (with the
exception of the SWBootReset function). The following code
puts the correct value in KEY1 and KEY2. The code starts with
a halt, to force the program to jump directly into the setup code
and not run into it.
halt
SSCOP: mov [KEY1], 3ah
mov X, SP
mov A, X
add A, 3
mov [KEY2], A
9.4.1
The SROM also features Return Codes and Lockouts.
Return codes aid in the determination of success or failure of
a particular function. The return code is stored in KEY1’s
position in the parameter block. The CheckSum and
TableRead functions do not have return codes because
KEY1’s position in the parameter block is used to return other
data.
Return Codes
Read, write, and erase operations may fail if the target block
is read or write protected. Block protection levels are set
during device programming.
The EraseAll function overwrites data in addition to leaving the
entire user Flash in the erase state. The EraseAll function
loops through the number of Flash macros in the product,
executing the following sequence: erase, bulk program all
zeros, erase. After all the user space in all the Flash macros
are erased, a second loop erases and then programs each
protection block with zeros.
9.5
SROM Function Descriptions
9.5.1
The SROM function, SWBootReset, is the function that is
responsible for transitioning the device from a reset state to
running user code. The SWBootReset function is executed
whenever the SROM is entered with an M8C accumulator
value of 00h: the SRAM parameter block is not used as an
input to the function. This will happen, by design, after a
hardware reset, because the M8C's accumulator is reset to
00h or when user code executes the SSC instruction with an
accumulator value of 00h. The SWBootReset function will not
execute when the SSC instruction is executed with a bad key
value and a non-zero function code. An enCoRe II device will
execute the HALT instruction if a bad value is given for either
KEY1 or KEY2.
The SWBootReset function verifies the integrity of the
calibration data by way of a 16-bit checksum, before releasing
the M8C to run user code.
SWBootReset Function
9.5.2
The ReadBlock function is used to read 64 contiguous bytes
from Flash: a block.
The first thing this function does is to check the protection bits
and determine if the desired BLOCKID is readable. If read
protection is turned on, the ReadBlock function will exit setting
the accumulator and KEY2 back to 00h. KEY1 will have a
value of 01h, indicating a read failure. If read protection is not
enabled, the function will read 64 bytes from the Flash using
a ROMX instruction and store the results in SRAM using an
MVI instruction. The first of the 64 bytes will be stored in SRAM
at the address indicated by the value of the POINTER
parameter. When the ReadBlock completes successfully the
accumulator, KEY1 and KEY2 will all have a value of 00h.
ReadBlock Function
9.5.3
The WriteBlock function is used to store data in the Flash. Data
is moved 64 bytes at a time from SRAM to Flash using this
function. The first thing the WriteBlock function does is to
check the protection bits and determine if the desired
BLOCKID is writable. If write protection is turned on, the Write-
Block function will exit setting the accumulator and KEY2 back
to 00h. KEY1 will have a value of 01h, indicating a write failure.
The configuration of the WriteBlock function is straightforward.
The BLOCKID of the Flash block, where the data is stored,
must be determined and stored at SRAM address FAh.
WriteBlock Function
Table 9-2. SROM Function Parameters
Variable Name
SRAM Address
0,F8h
0,F9h
0,FAh
0,FBh
0,FCh
0,FDh
0,FEh
0,FFh
Key1/Counter/Return Code
Key2/TMP
BlockID
Pointer
Clock
Mode
Delay
PCL
Table 9-3. SROM Return Codes
Return Code
00h
01h
Description
Success
Function not allowed due to level of protection
on block.
Software reset without hardware reset.
Fatal error, SROM halted.
02h
03h
Table 9-4. ReadBlock Parameters
Name
KEY1
KEY2
Address
0,F8h
0,F9h
Description
3Ah
Stack Pointer value, when SSC is
executed.
Flash block number
First of 64 addresses in SRAM
where returned data must be stored
BLOCKID
POINTER
0,FAh
0,FBh
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY7C63813-PXC 功能描述:USB 接口集成電路 USB Peripheral Cntrl 8K/256 18-PDIP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C63813-PXCES 制造商:Cypress Semiconductor 功能描述:
CY7C63813-SXC 功能描述:USB 接口集成電路 USB Peripheral Cntrl 8K/256 18-SOIC RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C63813-SXCES 制造商:Rochester Electronics LLC 功能描述: 制造商:Cypress Semiconductor 功能描述:
CY7C63823-3XWC 制造商:Cypress Semiconductor 功能描述:USB - Bulk 制造商:Cypress Semiconductor 功能描述:Bulk / USB Low-Speed Peripherals
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