ADP315PC87570 National Semiconductor, ADP315PC87570 Datasheet - Page 16

• Manufacturer Part Number: ADP315PC87570
• Description: Keyboard and Power Management Controller
• Manufacturer: National Semiconductor

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1.3.1
In this environment, after reset, (internal power-on reset cir-
cuit or an external pulse on HMR pin), the PC87570 starts
running the code written in the internal mask-ROM. This
ROM contains the PC87570’s boot program which is read-
only. The boot-code size can be up to 2 Kbytes. After com-
pletion of the boot program, the process is handed over to
the External Memory. In the External Memory resides the
user-defined application.
The boot program performs several basic task needed to
start the system in a safe and ordered way. It checks if the
External Memory holds valid code. In case the code is in-
valid, it allows the host processor to re-program the Flash
device. See also Section B.1 on page 164.
IRE Environment
Configuration
(power-up reset)
32.768 KHz
Control
Battery
Inputs
Crystal
Reset
Clock
RTC
or
External Keyboard
NC
NC
Interface
HMR
32KX1/32KCLKIN
32KX2
V
HD7-0
HA18-0
HAEN
HIOR
HIOW
HIOCHRDY
HMEMRD
HMEMWR
HMEMCS
IRQ1
IRQ8
IRQ11
IRQ12
GA20
HRSTO
HPWRON
ENV1
ENV0
SHBM
HRMS
HDEN
TRIS
BAT
Figure 1-1. IRE Environment
Introduction
External Mouse
16
PC87570
To maximize on-chip ROM performance, configure the BIU
as described in Section 3.6 on page 46.
The majority of applications use the PC87570 in IRE envi-
ronment, which provides up to 10 on-chip I/O ports with a to-
tal of 76 GPIO signals. The ports are: PA6-0, PB7-0, PC7-
0, PD7-0, PE1-0, PF7-0, PG4-0, PH5-0, KBSIN7-0 and
KBSOUT15-0.
In addition, the PC87570 provides an interface to External
Memory and a variety of system functions, including ADC
and DAC, Timers, Interrupts, PM, ACCESS.bus/SMBus, and
other features (some features are mutually exclusive).
See Figure 1-1 for a system example in IRE environment.
In this environment, the ENV0 and ENV1 strap pins do not
need any external pull-up resistors.
Interface
EXINT0,10,11,15
A18-16, A15-0
KBSOUT15-0
Auxiliary PS/2
KBSIN7-0
Interface
WR1-0
SELIO
PC7-0
PD7-0
PG4-0
PH5-0
AD7-0
DA3-0
AGND
PA6-0
PB7-0
PE1-0
AVCC
D15-8
PF7-0
PFAIL
SWIN
RING
SEL0
SEL1
V
GND
D7-0
VCC
SDA
SCL
PC0
REF
RD
TB
TA
NC
ADC
DAC
(Application)
ACCESS.bus
Expansion
Keyboard
SRAM or
Interrupt
External
Memory
System
Internal
(Matrix)
Timers
Power
Supply
Flash
GPIO
I/O
Analog