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Preliminary User’s Manual U14913EE1V0UM00
Chapter 4
Bus Control Function
The V850E/CA1 / ATOMIC is provided with an external bus interface function by which external memo-
ries 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 (CS2 to 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
•
Bus mastership arbitration function
•
Bus hold 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)
PDL0 to PDL15 (Port DL)
PMCDL
Address bus (A0 to A15)
PAL0 to PAL15 (Port AL)
PMCAL
Address bus (A16 to A23)
PAH0 to PAH7 (Port AH)
PMCAH
Chip select (CS2 to CS4)
PCS2 to PCS4 (Port CS)
PMCCS
Read/write control (LWR, UWR, RD)
PCT0, PCT1, PCT4 (Port CT) PMCCT
External wait control (WAIT)
PCM0 (Port CM)
PMCCM
Internal system clock (CLKOUT)
PCM1 (Port CM)
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