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Preliminary User’s Manual U15839EE1V0UM00
Chapter 4
Bus Control Function
The V850E/CA2 Jupiter is provided with an external bus interface function by which external memories
such as ROM and RAM, and I/O can be connected.
4.1 Features
•
16-bit/8-bit data bus sizing function
•
8 chip areas select function
- 3 chip area select signals externally available (CS0,CS3 and CS4)
•
Wait function
- Programmable wait function, capable of inserting up to 7 wait states for each memory block
- External wait function through WAIT pin
•
Idle state insertion function
•
External device connection can be enabled via bus control/port alternate function pins
4.2 Bus Control Pins
The following pins are used for connecting to external devices.
Bus Control Pin (Function when in Control Mode)
Function when in Port Mode
Register for Port/Control
Mode Switching
Address data Data bus (D0 to D15)
-
-
Address bus (A0 to A15)
-
-
Address bus (A16 to A23)
PAH0 to PAH7 (Port AH)
PMCAH
Chip select (CS0, CS3 and CS4)
PCS0, PCS3 and PCS4 (Port CS) PMCCS
Read/write control (LWR, UWR, RD)
PCT0, PCT1, PCT4 (Port CT)
PMCCT
Internal system clock (WAIT)
PCM0 (Port CM)
PMCCM
Содержание mPD703128
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