upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 71

Manufacturer Part Number

upd70f3422gj-gae-qs-ax

32-bit Single-chip Microcontroller

Manufacturer

Renesas Electronics Corporation.

Pin Functions

2.4.3 External memory interface of µPD70F3427

The µPD70F3427 is equipped with an external memory interface. The data

bus width can be chosen between 16-bit D[15:0] and 32-bit D[31:0].

The signals of the external memory interface are partly shared with ports

respectively alternative functions and are controlled by different means, as

listed in Table 2-21.

The upper data bus lines D[31:16] are made available by setting

PMC.PMC143 = 1. Thus this bit changes the interface from 16- to 32-bit mode.

All other bus interface signals are available via group 14 (also usable as 3-bit I/

O port) and the permanent MEM-I/F group.

External memory interface pin control

Preliminary User’s Manual U17566EE1V2UM00

Ext. memory I/F

PMC.PMC143 = 0

PMC.PMC140 = 0

PMC.PMC141 = 0

PMC.PMC142 = 0

Port/alternative

Mode control

PMC.PMC143 = 1

PMC.PMC140 = 1

PMC.PMC141 = 1

PMC.PMC142 = 1

Ext. Memory I/F