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T83C5101 Datasheet(PDF) 7 Page - ATMEL Corporation

Part # T83C5101
Description  8-bit Low Pin Count Microcontrollers
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T83C5101 Datasheet(HTML) 7 Page - ATMEL Corporation

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7
T8xC5101/02
4233H–8051–02/08
Low Pin Count
Specificities
The T8xC5101/02 family is not able to perform any external memory access, such as a
code fetch, a look-up table access (using MOVC) or a data access (using MOVX)
because traditional Port ×0 and Port 2 are not implemented. It should be noted that 2
bits of a new port 4 are available, but they are pure user outputs. On the 28 pin package,
there is also a set of 4 extra I/Os, which cannot be used for external access.
This inability to perform external memory accesses has the following consequences:
Port 0 SFR doesn’t exist
Port 2 SFR doesn’t exist
Port 4 has six bits defined among which two are pure outputs for LED driving.
Security level 4 is no longer applicable
Code memory addresses is limited to 4000h. Accessing to any address above
3FFFh will return indeterminate value. Jumps, subroutine Calls, MOVC instructions
should be limited to a maximum address range of 3FFFh to avoid any error.
External data memory addresses is limited to 100h. Writing to any address above
FFh will have no effect. Reading any address above FFh will return indeterminate
value. To avoid any mistake, MOVX address should be limited to a maximum
address range of FFh.
In Rx devices, the user could disable the XRAM (for example, if he had shared
resource at the corresponding address range). As no external access is possible
with the T83/87C510x, it makes no sense to be able to disable accesses to XRAM.
Nevertheless, access to AUXR bit 1 will cause no error and any write to this bit will
have no effect.
As there is no external access, EA, ALE, PSEN, RD and WR signals are not
implemented. So, the corresponding pins or alternate functions are removed.
As there is no ALE, there is no need for ALE disabling. Nevertheless, access to
AUXR bit 0 will cause no error and any write to this bit will have no effect.
Compared to the corresponding 16 KB Rx2 device, the TS80C51RB2, the following
features are removed:
Port 0 & 2
PCA
Watchdog
ONCE mode
Power Off Flag (POF)


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