UPD75P3216GT Renesas Electronics America, UPD75P3216GT Datasheet - Page 13

• Manufacturer Part Number: UPD75P3216GT
• Manufacturer: Renesas Electronics America

Specifications of UPD75P3216GT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4. Mk I AND Mk II MODE SELECTION FUNCTION
between Mk I mode and Mk II mode. This function is applicable when using the µ PD75P3216 to evaluate the µ PD753204,
753206, or 753208.
4.1 Difference between Mk I Mode and Mk II Mode
Program counter
Program memory (bytes)
Data memory (bits)
Stack
Instruction
Supported mask ROMs
Instruction
execution time
Setting a stack bank selection (SBS) register for the µ PD75P3216 enables the program memory to be switched
When the SBS bit 3 is set to 1: sets Mk I mode (supports Mk I mode for µ PD753204, 753206, and 753208)
When the SBS bit 3 is set to 0: sets Mk II mode (supports Mk II mode for µ PD753204, 753206, and 753208)
Table 4-1 lists points of difference between the Mk I mode and the Mk II mode for the µ PD75P3216.
Caution The Mk II mode supports a program area which exceeds 16K bytes in the 75X and 75XL series. This
mode enhances the software compatibility with products which have more than 16K bytes.
When the Mk II mode is selected, the number of stack bytes used in execution of a subroutine call
instruction increases by 1 per stack for the usable area compared to the Mk I mode. Furthermore,
when a CALL !addr, or CALLF !faddr instruction is used, each instruction takes another machine
cycle. Therefore, when more importance is attached to RAM utilization or throughput than software
compatibility, use the Mk I mode.
Stack bank
No. of stack bytes
BRA !addr1 instruction
CALLA !addr1 instruction
CALL !addr instruction
CALLF !faddr instruction
Item
Table 4-1. Difference between Mk I Mode and Mk II Mode
PC
16384
512 × 4
Selectable via memory banks 0, 1
2 bytes
None
3 machine cycles
2 machine cycles
When set to Mk I mode:
µ PD753204, 753206, and 753208
13-0
Data Sheet U10241EJ1V1DS
Mk I Mode
3 bytes
Provided
4 machine cycles
3 machine cycles
When set to Mk II mode:
µ PD753204, 753206, and 753208
Mk II Mode
µ PD75P3216
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