NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
Page
164
of
497
Rev 1.00
N
U
MICRO
®
N
UC02
9L
E
E
/N
UC029
S
E
E
T
E
CHN
ICA
L R
E
F
E
R
E
NC
E
M
A
NU
A
L
6.5 External Bus Interface (EBI)
6.5.1 Overview
The NuMicro
®
NUC029LEE/NUC029SEE LQFP-64 package equips an external bus interface
(EBI) for access external device.
To save the connections between external device and this chip, EBI supports address bus and
data bus multiplex mode. And, address latch enable (ALE) signal is used to differentiate the
address and data cycle.
6.5.2 Features
External Bus Interface has the following functions:
Supports external devices with max. 64 KB size (8-bit data width)/128 KB (16-bit data
width)
Supports variable external bus base clock (MCLK) which based on HCLK
Supports 8-bit or 16-bit data width
Supports variable data access time (tACC), address latch enable time (tALE) and
address hold time (tAHD)
Supports address bus and data bus multiplex mode to save the address pins
Supports configurable idle cycle for different access condition: Write command finish
(W2X), Read-to-Read (R2R)