TMS370CX7X Datasheet, PDF (12/59 Pages) Texas Instruments – 8-BIT MICROCONTROLLER

TMS370Cx7x
8-BIT MICROCONTROLLER
SPNS034C – SEPTEMBER 1995 – REVISED FEBRUARY 1997
data EEPROM (continued)
Table 5. Data EEPROM and Program EPROM Control Registers Memory Map
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _ADDRESS
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{101Ah (P01A)}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{101Bh (P01B)}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 101Ch (P01C)
101Dh (P01D)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{101Eh (P01E)}
SYMBOL
DEECTL
EPCTLM
EPCTLL
NAME†
Data EEPROM control register
Reserved
Program EPROM control register – middle array
Reserved
Program EPROM control register – low array
† For the 24K-byte EPROM device, the program memory is controlled by P01C and P01E.
program EPROM
The TMS370C777 contains 24K bytes of program EPROM made up of one 16K-byte array and one 8K-byte
array. The 16K-byte array is located at address locations 2000h through 5FFFh, and the 8K-byte array is located
at address locations 6000h through 7FFFh, as shown in Table 6.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _PARAMETER
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{EPROM size}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Memory mapped}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Control registers}
Table 6. TMS370C777 EPROM Memory Map
16K Bytes at 2000h – 5FFFh
EPCTLL (P01E)
VALUE
24K Bytes
8K Bytes at 6000h – 7FFFh
EPCTLM (P01C)
As shown in Table 6 for the two EPROM areas, the 16K-byte array is controlled by register EPCTLL located at
101Eh (P01E), and the 8K-byte array is controlled by register EPCTLM located at 101Ch (P01C).
Reading the program-EPROM modules is identical to reading other internal memory. During programming, the
EPROM is controlled by the program EPROM control registers EPCTLL and EPCTLM. The program EPROM
modules’ features include:
D Programming
– In-circuit programming capability if V_PP is applied to the MC pin
– Control register: Program EPROM programming is controlled by the program EPROM control registers
EPCTLL and EPCTLM, located at the addresses in PF frame 1 as shown in Table 5.
– Programming one EPROM module while executing the other
D Write-protection: Writes to the program EPROM are disabled under the following conditions:
– Reset: All programming to the EPROM module is halted.
– Low-power modes
– 13 V not applied to MC
program ROM
The program ROM consists of 24K bytes of mask-programmable ROM. The program ROM is used for
permanent storage of data or instructions. Programming of the mask ROM is performed at the time of device
fabrication. Memory addresses 7FE0h – 7FEBh is reserved for Texas Instruments (TI™). 7FECh to 7FFFh are
reserved for interrupt and reset vectors. Trap vectors, used with TRAP0 through TRAP15 instructions, are
located between addresses 7FC0h and 7FDFh.
TI is a trademark of Texas Instruments Incorporated.
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