AM186EM Datasheet, PDF (23/98 Pages) List of Unclassifed Manufacturers – MICROCONTROLLER BLOCK DIAGRAM

PRELIMINARY
LOGIC SYMBOL—Am186EM MICROCONTROLLER
Clocks
X1
X2
CLKOUTA
CLKOUTB
Address and
Address/Data Buses
* ^{20 A19–A0}
16 AD15–AD0
*
S6/CLKDIV2
*
UZI
Bus Control
3
*
*
*
ALE
S2–S0
HOLD
HLDA
RD
WR
DT/R
DEN
ARDY
SRDY
BHE/ADEN
WHB
WLB
RES
INT4
INT3/INTA1/IRQ
INT2/INTA0
INT1/SELECT
INT0
NMI
*
Reset Control and
* _{Interrupt Service}
PCS6/A2
*
PCS5/A1
*
PCS3–PCS0 ⁴ _*
LCS/ONCE0
MCS3/RFSH
Memory and
Peripheral Control
*
MCS2–MCS0 ³ _*
UCS/ONCE1
2
DRQ1–DRQ0
* _{DMA Control}
*
Timer Control ^*
*
*
TMRIN0
TMROUT0
TMRIN1
TMROUT1
Programmable
I/O Control
32
shared
**
PIO32–PIO0
TXD
RXD
* _Asynchronous
* ^{Serial Port Control}
SDEN1–SDEN0 ² _*
SCLK
*
SDATA
*
Synchronous
Serial Port Control
Notes:
* These signals are the normal function of a pin that can be used as a PIO. See the pin descriptions beginning on page 25 and
Table 2 on page 30 for information on shared function.
** All PIO signals are shared with other physical pins.
Am186/188EM and Am186/188EMLV Microcontrollers
23